Pseudo Jonathan Numbers 26:9

And it came to pass after the plague, that the compassions of the heavens were turned to avenge His people with judgment. And the Lord spake to Mosheh and Elazar bar Aharon the priest, saying: Take the sum of the account of the whole congregation of the Beni Israel, from twenty years old and upward, according to the house of their fathers, of every one who goeth forth with the host in Israel. And Mosheh and Elazar the priest spake with the leaders, and commanded that they should number them in the plain of Moab, by the Jordan (over against) Jericho, saying (You are to number them) from a son of twenty years and upward, as the Lord commanded Mosheh and the sons of Israel when they came out of the land of Mizraim. Reuben, the first‑born of Israel: the sons of Reuben, Hanok, the family of Hanok; of Phallu, the family of Phallu; of Hezron, the family of Hezron; of Karmi, the family of Karmi. These are the families of Reuben, and their numbers were forty‑three thousand seven hundred and thirty. And the sons of Phallu Eliab; the sons of Eliab, Nemuel, and Dathan, and Abiram. The same were Dathan and Abiram who brought together the congregation that gathered and made the division against Mosheh and Aharon in the congregation of Korach, when they gathered together and made division against the Lord, and the earth opened her mouth and swallowed them and Korach, when the congrergation of the wicked died, when the fire devoured the two hundred and fifty men, and they were made an example. But the sons of Korach were not in the counsel of their father, but followed the doctrine of Mosheh the prophet; and therefore they died not by the plague, nor were smitten by the fire, nor engulphed in the yawning of the earth. The Beni Shemeon, Nemuel, Jamin, Jakin, Zerach, Shaul, with their families, twenty‑two thousand two hundred.

Date: 300-1200 C.E.
* Dates are based on scholarly estimates

1 Clement 51:3

1 For all our transgressions which we have committed through any of the wiles of the adversary, let us entreat that we may obtain forgiveness. Yea and they also, who set themselves up as leaders of faction and division, ought to look to the common ground of hope. 2 For such as walk in fear and love desire that they themselves should fall into suffering rather than their neighbors; and they pronounce condemnation against themselves rather than against the harmony which hath been handed down to us nobly and righteously. 3 For it is good for a man to make confession of his trespasses rather than to harden his heart, as the heart of those was hardened who made sedition against Moses the servant of God; whose condemnation was clearly manifest. 4 for they went down to Hades alive, and Death shall be their shepherd. 5 Pharaoh and his host and all the rulers of Egypt, their chariots and their horsemen, were overwhelmed in the depths of the Red Sea and perished for none other reason but because their foolish hearts were hardened after that the signs and the wonders had been wrought in the land of Egypt by the hand of Moses the servant of God.

Date: 90-100 C.E.
* Dates are based on scholarly estimates