Mustadrak al-Hakim — Hadith 8507

It is narrated from Sayyiduna Jabir bin Abdullah (may Allah be pleased with them both) that the Prophet (peace and blessings be upon him) said to Ka'b bin Ujrah (may Allah be pleased with him): "O Ka'b, may Allah protect you from the rule of the foolish." He said: O Messenger of Allah, what is meant by the rule of the foolish? He (peace and blessings be upon him) said: "There will be rulers after me who will neither follow my guidance nor adhere to my Sunnah. Whoever affirms them in their lies and helps them in their oppression, such people are not of me and I am not of them, and they will not come to me at my Pond. And whoever does not affirm them in their lies nor help them in their oppression, those people are of me and I am of them, and they will certainly come to me at my Pond. O Ka'b bin Ujrah, fasting is a shield, charity extinguishes sins, and prayer is a means of nearness to Allah (or he (peace and blessings be upon him) said: a proof). O Ka'b bin Ujrah, flesh that has grown from unlawful wealth (suht) will never enter Paradise; the Fire is more fitting for it. O Ka'b bin Ujrah, people are of two kinds: one who strikes a bargain for his soul and frees it (through obedience to Allah), and the other who sells his soul (into the hands of Satan) and destroys it."
This hadith has a sahih (authentic) chain of narration, but the two Shaykhs did not record it.