Onkelos translates this commandment: לא תיכול בשר בחלב “Thou shalt
not eat meat in milk,” in accordance with the Oral Law. The threefold
repetition of the commandment forbidding the seething of a kid in its
mother’s milk is explained traditionally to indicate a threefold
prohibition: that of boiling meat and milk together, that of eating
such mixture, and that of deriving any benefit whatever from it
(ואיסור, איסור אכילה, איסור בישול הנאה). In obedience to the
principle, “Make a fence round the Law,” we abstain from milk or butter
for some time after having partaken of meat.