Rashi on Numbers 15:12/רש"י על במדבר ט״ו:י״ב

1כמספר אשר תעשו ACCORDING TO THE NUMBER THAT YE SHALL PREPARE — This means: according to the number of animals that you will offer as sacrifices, ככה תעשו SO SHALL YE OFFER drink-offerings for each of them, כמספרם ACCORDING TO THEIR NUMBER — i.e. as is the number of animals so shall be the number of drink-offerings.