It seems that the WTS have dropped the phrase nowadays. I compared several texts in the old NWT against the 2013 edition and I could not find it in the later index.
Lev.3 : 17. (1984 NWT)
‘It is a statute to time indefinite for YOUR generations, in all YOUR dwelling places: YOU must not eat any fat or any blood+ at all.’”
(2013 NWT)
"It is a lasting statute for your generations, in all your dwelling places: You must not eat any fat or any blood+ at all.’”
There were plenty of other example but I had to look up my old printed Comprehensive Concordance.