hmike..the greater value of love and compassion was in fact the very opinion of the Pharisee Rabbis.
For instance: "And you shall love your neighbor as yourself. R. Akiba said: This is the great general principle in the Torah" (Sifra Qedoshim, 4). This injunction is from the Torah (cf. Leviticus 19:18), and it was combined with Deuteronomy 6:4 as the epitome of all the laws of the Torah. This view was also expressed by Philo of Alexandria: "But among the vast number of particular truths and principles studied, two, one might almost say, stand out higher than all the rest, that of relating to God through piety and holiness, and that of relating to fellow man through a love of mankind and of righteousness" (Special Laws, 2.63). The view in Matthew is also expressed in Paul (cf. Romans 13:9, Galatians 5:14) and in James 2:8. The difference between Paul and Matthew is that Paul dispenses with the so-called minor commandments in favor of the general principle, while Matthew stresses their lasting importance: "Anyone who relaxes even one of the least of these commandments and teaches men to do so, shall be called least in the kingdom of heaven" (Matthew 5:18-19). The same view is expressed in James: "For whoever keeps the whole Law but fails in one point has become guilty of all of it" (2:10). This too was a rabbinical view common with the Pharisees. We thus read: "Rabbi said: 'Be careful with a minor commandment as with a major one, for you do not know what reward is given for keeping one commandment or another.' Ben Azzai said: 'Run after a minor commandment just as after a major one' " (m. Abot 2:1, 4:2). The same thought also occurs in the first-century 4 Maccabees: "To transgress the Law in matters either small or great is quite the same, for in either case the Law is being treated with disdain" (5:20).
The Jesus of Matthew and to a lesser extent of Luke is presented as engaged in the rabbinical disputes of his time, and as delivering halacha on the Torah. The dispute in Luke 10:25-29 is based on the interpretation of Leviticus 19:17, and the interpretation Jesus rejects in that passage (which is stated explicitly in Matthew 5:43: "You shall love your neighbor and hate your enemy"), rejects the view found in 4 Maccabees 2:13 and 1QS 9:16-21 that assumes that such love applies only to "friends" and does not include love for enemies. The view expressed on marriage in Matthew 5:31-32 is well rooted in rabbinical disputes between the schools of Hillel and Shammai on the interpretation of Deuteronomy 24:1-4, and Jesus comes out on the side of Shammai and the Essenes (cf. 11QTemple 57:15-19; Damascus Document 4:20-5:2; m. Gittin 9:10: "Let not a man divorce his wife unless he found in her some matter of indecency"). The forbidding of oaths in Matthew 5:33-37 (echoed in James 5:12) is based on an application of Exodus 20:7 that extended an original prohibition of using God's name in vain to the uttering of vain oaths (cf. Sirach 23:9-10; Philo, Special Laws 2.2; Josephus, Jewish Antiquities 3.91; 1QS 6:27; Midrash Tanhuma, Mattot 1). Most of ch. 5 of Matthew (especially v. 21-48) is an extended interpretation of various commandments in the Law, 9:10-13 interprets Hosea 6:6 as another principle governing observance of the Law, the dispute on picking corn on the sabbath in 12:1-8 is a classic example of Matthean rabbinical interpretation which supports its argument with a midrash of 1 Samuel 21:4-7 and again uses Hosea 6:6 as a general principle, and ch. 15 and 16 give many other examples. One crucial text is Matthew 15:2 (= Mark 7:1-13) in which the Pharisees complain that Jesus and his disciples "break away from the tradition of the elders". This refers to the oral halacha of the Pharisees. Jesus replies that the Pharisees have themselves broken away "from the commandment of God for the sake of your tradition" (v. 3). In no sense is Jesus here trying to get rid of the Torah or abolish it. Instead he presents himself as more faithful to the Torah than the Pharisees. The oral halacha that the rabbi Jesus (cf. 26:25, 49) delivers is regarded by the authors of Mark and Matthew as the correct interpretation of God's "commandments" whereas the halacha of the Pharisees supplants the Torah with their own tradition (cf. their example of cursing parents, drawn from Leviticus 20:9 and Deuteronomy 5:16). It is interesting to compare this with the charge in Acts 21:21 that Paul has instructed "Jews living among the pagans to break away from Moses". The Jewish Christians associated with James the Just, according to the author of Acts, would put Paul into the same group that the authors of Mark and Matthew put the Pharisees: those who break away from the commandments of Moses in the Torah. Of course, Matthew has greatly intensified the anti-Pharisee rhetoric found in Mark; especially in the addition of the incinderary ch. 23. Kenneth Newport has an interesting book on The Sources of Sitz im Leben of Matthew 23 which, tho I disagree with the overall thesis, presents some convincing evidence that the author of this chapter was in close enough contact with the Pharisees to know their common practices. At the same time, there clearly was a good deal of ideological distance (e.g. "their synagogues" in 4:23, 9:35 when addressing fellow Christians and "your synagogues" in 23:34 when addressing the Pharisees), but the polemical and stereotypical language is actually evidence of the proximity of the two groups rather than of the distance between Matthean Christians and an otherwise distant and ambiguous group (cf. Sims, p. 186).