John Wesley on Numbers 6:19

The shoulder - The left - shoulder, as it appears from Num 6:20, where this is joined with the heave - shoulder, which was the right - shoulder, and which was the priests due in all sacrifices, Lev 7:32, and in this also. But here the other shoulder was added to it, as a special token of thankfulness from the Nazarites for God's singular favours vouchsafed unto them. The hands - That he may give them to the priest, as his peculiar gift.