13You are to have the Levites stand before Aaron and his sons and then present them before the LORD as a wave offering. 14In this way you shall separate the Levites from the rest of the Israelites, and the Levites will belong to Me. 15After you have cleansed them and presented them as a wave offering, they may come to serve at the Tent of Meeting.
“A wave offering was a portion of a sacrifice presented to God, then released by God for the use of those involved in the sacrifice. The meat fed the families of the priests.”
https://www.gotquestions.org/wave-offering.html
“The priests had their hands filled. Certain parts of the ram were taken, and “one loaf of bread, and one cake of oiled bread, and one wafer out of the basket of unleavened bread, which is before the LORD,” and all these were put into the hands of Aaron and his sons, so that they stood with their hands full before the Lord. See the beauty of this, and pray for a complete realization of it yourself. The Lord intends to make you a priest, but your hands are full of sin. What have you to do? You must lay those guilty hands on the sin offering, and make confession, and exercise faith, then the sin is gone, being transferred to another, and your hands are empty.
What next? Will the Lord leave you empty-handed? No, He gives you something to offer. He allows you a part of the peace offering to fill your hands withal, and this you present before Him as a wave offering.
It is a blessed thing to stand before God with your hands full of Christ. The service which consists in holding forth Jesus is most blessed. I love preaching when I have to preach Jesus only. Then I come before you, not empty-handed, but loaded with meat and bread for you. How idle it is for us to stand before God with nothing to offer, and if we have not Jesus we have nothing, or worse than nothing.” (Spurgeon)
Are your hands full of Christ or full of sin?
Blessings