The Mighty One, God, the Lord, has spoken, And summoned the earth from the rising of the sun to its setting. "I know every bird of the mountains, And everything that moves in the field is Mine." Psalms 50:1, 11
There's an old joke about toddlers all having the same motto regarding ownership, namely "What's mine is mine, and what's yours is mine." But what does it mean to belong to God? What does it mean for God to say "you are mine"?
We know from Genesis chapters one and two that God established the earth. He created everything, birds, animals, fish, trees, land, water, sky - even light itself came from God. He is the source of all life.
And then Colossians 1:16-17 tells us, "For by him all things were created, in heaven and on earth, visible and invisible. . . all things were created through him and for him. And he is before all things, and in him all things hold together." So, not only did God create all things, we are told that He also sustains all creation, by carefully, lovingly, watching over it and holding it together.
Not only do plants and animals belong to God, but as part of His creation, we also belong to Him. Jesus tells us in Matthew 6:26 "Look at the birds of the air, that they do not sow, nor reap nor gather into barns, and yet your heavenly Father feeds them. Are you not worth much more than they?" Jesus is gently pointing out that we are of greater worth to God than the rest of creation.
In fact, Deuteronomy 7:6a says, “For you are a people holy to the Lord your God. The Lord your God has chosen you to be a people for his treasured possession. . ." We are God's treasured possession. As His creation He has already promised that He will sustain us, and now we see that He also treasures us. The words "treasured possession" bring to mind a family heirloom or a hard earned prize - something that is gently and lovingly cared for by its owner.
When God says "You are mine" He means that He has created us, He will sustain us, and He cares for us as His treasured possession.