Hadith No: 1
Al-Darami - Sunan al-Darami - Book of Inheritance - Chapter on the Inheritor Without Direct Descendants
Volume: (2) - Page Number: (365 / 366)
2972 - Yahya ibn Harlun narrated to us, from Asim who reported from al-Sha'bi, who said: "Umar ibn al-Khattab was asked about al-kalala, and he replied: 'I will speak about it based on my opinion. If it is correct, it is from Allah, and if it is wrong, it is from me and from Satan. I see it as encompassing everything except for parents and children.'" And when Umar was appointed as his successor, he said: "I would be too shy before Allah to contradict anything Abu Bakr said."

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Reference: Sunan al-Daaremi Book 2

Hadith No: 2
Al-Bayhaqi - al-Sunan al-Sughra - Book of Obligatory Shares - Chapter on Collateral Relatives
Volume: (2) - Page Number: (362)
2291 - And Abu Abdullah al-Hafiz narrated to us, saying: Abu al-Abbas Muhammad ibn Ya'qub narrated to us, saying: Yahya ibn Abi Talib narrated to us, saying: Yazid ibn Harun narrated to us, from Asim al-Ahwal who narrated from al-Sha'bi, who said: "Umar ibn al-Khattab was asked about al-Kalala, and he replied: 'I will speak about it based on my opinion. If it is correct, it is from Allah, and if it is wrong, it is from me and from Satan': I understand it to mean anyone other than a child or a parent.' When he was appointed as a successor, Umar said, 'I would be ashamed before Allah to contradict anything Abu Bakr said.'"

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Reference: Sunan al Sughra Book 2

Hadith No: 3
Al-Khatib al-Baghdadi - Al-Faqih wa al-Mutafaqih
Mentioning what has been narrated from the Companions and the Successors regarding ruling by ijtihad and the method of qiyas
Volume: (1) - Page Number: (490)
- Sheikh al-Hafiz Abu Bakr Ahmad ibn Ali ibn Thabit al-Khatib al-Baghdadi said: Al-Nasr ibn Muhammad ibn Ahmad ibn al-Ruqaqi narrated to us, saying: Isma'il ibn Ali al-Khatbi narrated to me, from Abdullah ibn Ahmad ibn Hanbal, who said: My father narrated to me, from Yazid ibn Harun, from Asim al-Ahwal who reported from al-Sha'bi, who said: Abu Bakr was asked about al-Kalalah, and he replied: "I will speak about it based on my opinion. If it is correct, it is from Allah, and if it is wrong, it is from me and from Satan," indicating, I believe, what excludes both son and father. When Umar was appointed as caliph, he said: "I am indeed shy before Allah to oppose anything Abu Bakr said."

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Reference: Al faqeeh wal mutfaqah Book 1

Hadith No: 4
Al-Muttaqi al-Hindi - Kanz al-Ummal fi Sunan al-Aqwal wal-Af'al
Volume: (11) - Page Number: (79/80)
30691 - From al-Sha'bi, who said: Abu Bakr was asked about kahlalah, and he said: "I will speak about it based on my opinion. If it is correct, then it is from God alone, without any partner. And if it is wrong, then it is from me and from Satan, and God is innocent of it." He understood it to mean everything except a parent and child. So when Umar was appointed as his successor, he said: "Kahlalah is anything other than a child," - and in another narration: "one who has no child." When Umar was mortally wounded, he said: "I would be ashamed before God to oppose Abu Bakr. I believe that kahlalah is what is except for a parent and child."

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Reference: Kanz al-Ummaal fi Sunan al-Aqwaal wa al-Af'aal Book 11

Hadith No: 5
Al-Suyuti - al-Durr al-Manthur fi al-Tafsir bil-Ma'thur - Surah an-Nisa
Volume: (2) - Page Number: (756)
- .... Abd al-Razzaq, Sa'id ibn Mansur, Ibn Abi Shaybah, al-Darimi, Ibn Jarir, Ibn Mundhir, and al-Bayhaqi in his Sunan narrated from al-Sha'bi who said:Al-Bukayr was asked about al-Kalala, and he replied: I will speak about it based on my opinion, so if my answer is correct, it is from Allah alone, without any partner, and if it is wrong, it is from me and from Satan, and Allah is innocent of it. I understand it to mean anything except for children and parents. When Umar was appointed as his successor, he said: Al-Kalala is what excludes children. When Umar was mortally wounded, he said: I feel ashamed before Allah to disagree with Abu Bakr (ra).

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Reference: Al-Durr al-Manthoor fi Tafseer al-Mathoor Book 2