Leviticus 22 talks about the ways in which the priests must conduct themselves if they are to remain holy. Part of the priests job was to eat much of the food that was sacrificed to God. The food was holy to the Lord, and because of this, only certain people were allowed to eat of it. Here is that description:
 “A lay person shall not eat of a holy thing; no foreign guest of the priest or hired servant shall eat of a holy thing,  but if a priest buys a slave as his property for money, the slave may eat of it, and anyone born in his house may eat of his food.
(Leviticus 22:10-11 ESV)
So, no lay person or guest, foreigner or servant could eat of the holy things. But a purchased slave or a child of the priest may eat it. Only those who were part of the family of the priest by blood or by price could partake.
In Christ, we are both sons and slaves of God. We have been adopted into the family of God through the blood of Christ, but by that very same blood, we have been purchased to serve our Lord and Master with joy. And we partake of the holiness of God. Ephesians 1:3 says that God has blessed us in Christ with EVERY spiritual blessing in the heavenly places. We are free to take part in the glory of God because we have been purchased and adopted.
God is our loving Father and our gracious Master who blesses us freely in Christ. Let us rejoice in that today.