12:108 Say (O Prophet), “This is my way. Resting my call upon reason, I am calling you all to God, I and those who follow me. Glory to God! And I am not one of those who ascribe divinity in any form besides Him.” [We do not invite through blind faith, vague dogmas or by stunning your intellect with miracles]
12:109 And even before you, We sent none but men to whom We revealed Our messages – (Men) chosen from the people of the townships. Have they then never journeyed about the earth to see what happened in the end to those who lived before them? But the home of the Hereafter is best for those who live upright. Will you not then, use reason?
12:110 There have been times when even the Messengers had lost all hope of reformation and thought that they had been denied. Then came Our help. We saved according to Our laws (those worthy of being saved). And none can repel Our retribution from the guilty who thrive on the fruit of others’ toil.
There are other verses that say there were no miracles presented to people to change their beliefs, so there were no snakes for Moses.