Here is another pre-mortal existence verse:
Jeremiah 1:5
5 Before I formed thee in the belly I knew thee; and before thou camest forth out of the womb I sanctified thee, and I ordained thee a prophet unto the nations.
God's knowing us and ordaining us, doesn't mean man pre-existed before man was created. God knew Jeremiah at that time but Jeremiah didn't know God at that time.
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