This verse sounds like God is telling Moses to tell the Israelites what they should do, but from what needs to be done it sounds like he is really going to be telling the priests what God wants done. Therefore the question of who are the "sons of Israel.",
1 Then the Lord spoke to Moses, saying,
2 “Command the sons of Israel and say to them, ‘You shall [a]be careful to present My offering, My food for My offerings by fire, of a soothing aroma to Me, at their appointed time.’
3 You shall say to them, ‘This is the offering by fire which you shall offer to the Lord: two male lambs one year old without defect as a continual burnt offering every day.