Say: If your fathers and your sons and your brethren and your mates and your kinsfolk and property which you have acquired, and the slackness of trade which you fear and dwellings which you like, are dearer to you than Allah and His Messenger and striving in His way, then wait till Allah brings about His command: and Allah does not guide the transgressing people.

So go you both to him and say: Surely we are two messengers of your Lord; therefore send the children of Israel with us and do not torment them! Indeed we have brought to you a communication from your Lord, and peace is on him who follows the guidance;

That is because there came to them their messengers with clear arguments, but they said: Shall mortals guide us? So they disbelieved and turned back, and Allah does not stand in need (of anything), and Allah is Self-sufficient, Praised.