Virtues of al-Hasan bin Ali (may Allah be pleased with him): the supplication in the Witr prayer

It is narrated from Abu Hazim that he said: I was present on the day Sayyiduna Hasan bin Ali (may Allah be pleased with them both) died. I saw Sayyiduna Husayn bin Ali (may Allah be pleased with them both) prodding Sa'id bin al-As in the neck and saying: "Go forward (and lead the funeral prayer); were it not the Sunnah, I would never have put you forward." And there was some ill feeling between them. Sayyiduna Abu Hurayrah (may Allah be pleased with him) said: Do you begrudge the son of your Prophet (peace and blessings be upon him) the soil (a grave site) in which you would bury him, when I heard the Messenger of Allah (peace and blessings be upon him) say: "Whoever loves them both has loved me, and whoever bears hatred toward them both has borne hatred toward me."
This hadith has a sahih (authentic) chain, but the two Shaykhs (Bukhari and Muslim) did not record it.

It is narrated from Sayyiduna Hasan bin Ali (may Allah be pleased with them both) that he said: The Messenger of Allah (peace and blessings be upon him) taught me (this supplication to recite) in the witr prayer, when I raise my head (from bowing) and nothing remains but the prostration, to say: 'Allahumma-hdini fiman hadayt, wa 'afini fiman 'afayt, wa tawallani fiman tawallayt, wa barik li fima a'tayt, wa qini sharra ma qadayt, innaka taqdi wa la yuqda 'alayk, innahu la yadhillu man walayt, tabarakta wa ta'alayt' (O Allah, guide me among those You have guided, grant me well-being among those You have granted well-being, take me into Your care among those You have taken into Your care, bless me in what You have given me, and protect me from the evil of what You have decreed. Indeed, You decree and none can decree against You. Indeed, the one whom You befriend is never humiliated. Blessed are You and Most High).
This hadith is sahih (authentic) on the condition of the two Shaykhs (Bukhari and Muslim), except that Muhammad bin Ja'far bin Abi Kathir differed from Isma'il bin Ibrahim bin Uqbah regarding its chain.