One is "The LORD's portion is His people." Deuteronomy 32:9. That is God's side.
And the other passage is this: "The LORD is my portion." Lamentations 3:24
God and I possess each other. God finds His portion in His people and His people find their portion in God.
His heart is mine; for He loves me.
His eyes are mine; for they watch me from morning until night.
His hand is mine; for it is stretched out to uphold me.
This God is mine; in all His glorious perfections!