Exodus 13:2 English Standard Version (ESV) “Consecrate to me all the firstborn. Whatever is the first to open the womb among the people of Israel, both of man and of beast, is mine.”

Exodus 13:2 King James Version (KJV) Sanctify unto me all the firstborn, whatsoever openeth the womb among the children of Israel, both of man and of beast: it is mine.

The words used here are consecrate and sanctify were the Hebrew word is qāḏaš. It’s meaning according to biblical outline usage is to be set apart, to treat as sacred, to be hallowed, to regard or treat as sacred. Strong’s Definition adds; to be (causatively, make, pronounce or observe as) clean (ceremonially or morally)

Obviously this is human effort at God’s direction. This returns us once again to Paul’s Romans 6:19 comment about human limitation. This is in reference to the first fruits offering unto the Lord. Once it belongs to the Lord it is no longer under our control except in how we view it, treat it, and respect it while it is under our care. It belongs to the Lord.

Obviously the additional requirement for cleaning means that it will be regularly cleansed because they will come in contact with contamination. Think of Jesus washing the disciple’s feet as an example. This also it a representative example of forgiveness of sin.

While we make these efforts there is also one interesting aspect of what God considers, His view, His treatment of us being sanctified.

Colossians 3:3 English Standard Version (ESV) For you have died, and your life is hidden with Christ in God.

God considers us His and separated unto Himself.

Believe what God thinks of us is more important than what we think of ourselves.