'Besides' in the Bible

Joab returned from his pursuit of Abner, and when he had mustered his entire army, nineteen of David's soldiers were missing besides Asahel.

This is why You are great, Lord God. There is no one like You, and there is no God besides You, as all we have heard confirms.

And the king said to Ittai the Gittite, Why dost thou also go with us? return to thy place, and abide with the king; for thou art a foreigner, and besides, thou hast emigrated to the place where thou dwellest.

Besides, you only arrived yesterday; should I make you wander around with us today while I go wherever I can? Go back and take your brothers with you. May the Lord show you kindness and faithfulness.”

Besides, who else should I be serving? Why not the son? The same way I served your father, I'll serve you."

For who is God besides the Lord?And who is a rock? Only our God.