מדרש על יונה 3:3

The great city of God: Why was Nineveh called a great city of God? Because they were evil through their bodies in forbidden sexual relations, as it is written, "How can I do this great evil and sin before God (Genesis 39:9)?

Another interpretation (of Job 23:13): BUT HE HAS ONENESS; SO WHO CAN TURN HIM? <AND WHATEVER HIS SOUL DESIRES, HE DOES>. Because he stands alone in his world, no one refutes his words. Look at how much Jonah resisted going on his mission; yet it is stated (in Jonah 3:3): THEN JONAH AROSE AND WENT UNTO NINEVEH IN ACCORDANCE WITH THE LORD'S COMMAND…. <When> Jeremiah said to the Holy One (in Jer. 1:6): I AM <BUT> A LAD, the Holy One said to him (in vs. 7): DO NOT SAY: I AM <BUT> A LAD; FOR, WHEREVER I SEND YOU, YOU SHALL GO…. He did not budge until he went on the mission of the Holy One. Ergo (in Job 23:13): AND WHATEVER HIS SOUL DESIRES, HE DOES. In the case of Moses also: When the Holy One said to him (in Exod. 3:10): COME, I WILL SEND YOU UNTO PHARAOH, Moses said (in Exod. 4:13): PLEASE MAKE SOMEONE ELSE YOUR AGENT. The Holy One had said to him: I am saying to you: COME, I WILL SEND YOU; but you say: PLEASE MAKE SOMEONE ELSE YOUR AGENT. Let us see whose <will> prevails. He did not budge until he went (on his mission), as stated (in Exod. 4:18): THEN MOSES WENT (on his mission) AND (afterwards) RETURNED UNTO HIS FATHER-IN-LAW JETHER (i.e., Jethro).⁶⁷The midrash interprets the verse as referring to two separate acts, the fulfilling of the divine mission as represented by the verb WENT and the return to Jether. Exod. R. 4:4 explains further that apart from this interpretation the word WENT would be superfluous.