Hadith No: 1
Ahmad ibn Hanbal - Fada'il al-Sahabah (Virtues of the Companions) - Virtues of the Commander of the Faithful, Umar ibn al-Khattab (may he rest in peace)
Among the virtues of Umar ibn al-Khattab from the hadith of Abu Bakr ibn Malik
from his teachers, except for Abdullah ibn Ahmad, and among the virtues of Abu Bakr as well
Volume: (1) - Page Number: (337)
485 - Ahmad narrated to us, Quthna narrated to us, Suwayd ibn Sa'id narrated to us, al-Walid ibn Muhammad al-Mawquri narrated to us from al-Zuhri, who said: Al-Qasim ibn Muhammad told me that Asma bint Yazid informed him that a man from the muhajirin (emigrants) entered upon Abu Bakr when he was ill with the pain from which he would soon die. The man said: "O Abu Bakr, I remind you of Allah and the Day of Resurrection, for you have appointed a man over the people who is harsh and stern, who will intimidate the people without any authority, and Allah will question you about this." Abu Bakr replied: "Help me up," so they helped him up, and he said: "Are you threatening me with Allah? I say, 'O Allah, I have appointed for them the best of them.'"

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Reference: Fazael al-Sahabah Book 1

Hadith No: 2
Al-Bayhaqi - Sunan al-Kubra - Book of Fighting the People of Tyranny - Collection of Chapters on Shepherds - Chapter on Appointing a Successor
Volume: (8) - Page Number: (257)
16575 - Abu al-Husayn ibn Bishran narrated to us, saying: Abu Ja'far Muhammad ibn Amr al-Razzaz narrated to us, from al-Hasan ibn Mukarram, from Sa'id ibn Amir, from Salih ibn Rustam Abu Amir al-Khazzaz, from Ibn Abi Mulaykah, who said: Ibn Abbas narrated to me that Aisha, Mother of the Believers (ra), said: "When my father became ill, so-and-so and so-and-so entered upon him and said: 'O Caliph of the Messenger of Allah, what will you say to your Lord tomorrow when you stand before Him, having appointed Ibn al-Khattab as your successor over us?' She said: So we seated him, and he replied: 'Will you frighten me with Allah? I say I have appointed over them the best of them.'"

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Reference: Al-Sunan al-Kubra Book 8

Hadith No: 3
Ibn Sa'd - al-Tabaqat al-Kubra
Statement on the First Class, namely, the Badriyyin among the Emigrants and the Helpers
Classes of the Badriyyin among the Emigrants - and from the Banu Adi ibn Ka'b ibn Lu'ay
56 - Umar ibn al-Khattab - Mention of Umar's, may God have mercy on him, Appointment of a Successor
Volume: (3) - Page Number: (207)
[The text is lengthy, so only the relevant excerpt is provided here]

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Reference: Al-Tabaqaat al-Kubra Book 3

Hadith No: 4
Ibn Shiyah al-Nimri - Tarikh al-Medina
Mentioning the appointment of Umar by Abu Bakr and his succession and counsel to him
Volume: (2) - Page Number: (667)
[The text is lengthy, so only the relevant excerpt is provided here]
- .... From Zayd ibn Aslam, narrating from his father, who said: .... And some of the companions of the Prophet (peace be upon him and his holy progeny) heard this and entered upon Abu Bakr. One of them said to him: What will you say to your Lord if He asks you about your appointment of Umar as your successor over us, while you can see his severity? Abu Bakr replied: "Do you think you can intimidate me with Allah? Wretched is he who prepares for his fate with injustice." I will say, "O Allah, I have appointed over them the best of Your servants." Convey what I have said to those behind you ....

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Reference: Taareekh al-Madinah al-Munawwarah Book 2

Hadith No: 5
Al-Mutqi al-Hindi - Kanz al-'Ummal fi Sunan al-Aqwal wal-Af'al
Volume: (12) - Page Number: (535/536)
35721 - Narrated from Aisha who said: When my father became unwell, so-and-so and so-and-so entered upon him and said: "O Caliph of the Messenger of Allah, what will you say to your Lord tomorrow when you stand before Him, having appointed Umar ibn al-Khattab as your successor?" He replied: "Do you think I should be afraid of Allah? I will say: I appointed over them the best of them."

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Reference: Kanz al-Ummaal fi Sunan al-Aqwaal wa al-Af'aal Book 12