Numbers 8:8

8:8 Then they are to take a young bull with its grain offering of fine flour mixed with olive oil; and you are to take a second young bull for a purification offering. ¹ 

Numbers 29:14

29:14 Their grain offering must be of finely ground flour mixed with olive oil, three-tenths of an ephah for each of the thirteen bulls, two-tenths of an ephah for each of the two rams,

[8:8]  ¹ sn The first sacrifice was for the purification of the Levites. The second animal, which Moses was to take, would be used for the purification of the tabernacle from all pollution.