John Gill Commentary Numbers 6:17

"and he shall offer the ram for a sacrifice of peace-offerings unto Jehovah, with the basket of unleavened bread: the priest shall offer also the meal-offering thereof, and the drink-offering thereof." — Numbers 6:17 (ASV)

And he shall offer the ram [for] a sacrifice of peace
offerings unto the Lord
After he had offered the other two:

with the basket of unleavened bread ;
which went along with that:

the priest shall also offer his meat offering, and his drink offering :
of which he had his part, and were the usual appendages of other sacrifices; see (Numbers 28:1–29:40) .