Hadith No: 1
Al-Tabari - Dhakha'ir al-Uqba fi Manaqib Dhawi al-Qurbى
Part One: Regarding What Was Narrated About Relatives in a General and Overall Manner
Mentioning the Encouragement to Honor Them
Volume: (1) - Page Number: (18)
[The text is lengthy, so only the relevant excerpt is provided here]
- .... And from him it is narrated that he said: The Messenger of Allah (peace be upon him and his holy progeny) said: "Treat the people of my House well, for I will argue on your behalf regarding them tomorrow, and whoever I argue against will be at a disadvantage, and whoever I am at a disadvantage with will enter the Fire." This was reported by Abu Sa'd and al-Mulla in his biography.

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Reference: Dhakhayir Al Uqbaa Fi Manaqib Dhi alqurbaa Book 1

Hadith No: 2
Al-Qanduzi al-Hanafi - Yanabi' al-Mawadda li-Dhawi al-Qurba
Volume: (2) - Page Number: (115 > 439)
324 - And narrated from him marfully: "Treat my family with goodness, for I will argue on their behalf against you tomorrow," and whomever I take as an opponent, I will take as an opponent, and whoever I oppose will enter the Fire. Abu Sa'ad and Mulla mentioned this in their respective works.
207 - Ibn Sa'ad and Mulla mentioned in his biography: "Indeed, he (peace be upon him) said, 'Treat my family with goodness, for I will argue on their behalf against you tomorrow, and whomever I take as an opponent, I will take as an opponent, and whoever I oppose will enter the Fire.'"

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Reference: Yanabie Almawadat Lidhuyi Alqurbaa Book 2