Rashi on Leviticus 14:21/רש"י על ויקרא י״ד:כ״א

1ועשרון סלת אחד‎ AND ONE TENTH DEAL OF FLOUR — for this lamb which is a single one he shall bring one tenth part of flour to accompany its drink-offering.

2שמן ‎‏ ולג AND A LOG OF OIL — to place of it upon the thumbs. The quantity of the oil required for the libations of the meal-offering Scripture did not find it necessary to specify here (since it is given in Numbers 15:4 where three logs are prescribed; consequently the one log mentioned hero cannot be intended for the libations but for placing on the thumbs).