Midrash su I Re 1:9

(Num. 1, 2) So that they rose up before Moses, with certain men of the children of Israel in number two hundred and fifty, — i.e., the distinguished of the congregation. Called to the assembly; i.e., who were able through their wisdom to intercalate months and establish leap years. Men of renown; i.e., whose name was renowned through all the world. And Moses heard it, and fell upon his face. What had he heard? Samuel b. Nachmeni said in the name of R. Jonathan: "That they suspect him of adultery, as it is said (Ps. 106, 16) Moreover, they envied Hoses." (Num. 16) And Moses went to Dathan and Abiram. Resh Lakish said: "Infer from this that one must do all that he can not to strengthen a quarrel (since he himself who was a king went to Dathan and Abiram); for Rab said: 'He who strengthens a quarrel transgresses a negative commandment'." (Ib. 17, 5) That he become not as Korah and as his company. R. Ashi said: "Such is worthy to be punished with leprosy; for here (Ib.) it is written, by the hand of Moses, and it is written there (Ex. 4, 6) And he put his hand into his bosom, etc." R. Jose said: "He who fights against the kingdom of David deserves to be bitten by a snake, for it is written here (I Kings, 1, 9) … by the stone Zoheleth, and it is written there (Deut. 32, 24) With the poison of Zochle aphar (serpents)."