Hadith No: 1
Ibn Hajar al-Asqalani - Fath al-Bari Sharh Sahih al-Bukhari - Book on the Virtues of the Companions
Chapter on the Merits of Uthman ibn Affan, Abu Amr al-Qurashi (ra)
Volume: (7) - Page Number: (48)
[The text is lengthy, so only the relevant excerpt is provided here]
- .... His statement: (So bear witness that Allah has forgiven him and overlooked him) refers to His words, Almighty and Glorious be He: {Indeed, those who turned back among you on the day the two armies met, it was Satan who caused them to slip because of some of what they had earned, and Allah had certainly forgiven them. Indeed, Allah is Forgiving and Forbearing} (Surah Al-Imran 3:155).

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Reference: Fath al-Baari fi Sharh Saheeh al-Bukhari Book 7

Hadith No: 2
Ibn Hajar al-Asqalani - Al-Isabah fi Tamyiz al-Sahabah - Letter Sāʼ (س) without dots
Part One - Sāʼ with 'Ayn (ع) Following - Mention of Those Whose Name Was Sa'id - 3286: Sa'id ibn Uthman al-Ansari
Volume: (3) - Page Number: (95)
3286 - Sa'id ibn Uthman al-Ansari witnessed the Battle of Uhud. Ibn Rahwayh narrated in his Musnad from the path of al-Zubayr, who said: "By Allah, I can hear the words of Mu'tab ibn Qusayr while drowsiness overwhelms me: 'If we had any say in the matter, we would not have been killed here' (referring to the events of Surah Aal Imran)." Then he said, and his statement: {Indeed, those who turned back among you on the day the two armies met were only led astray by Satan because of some of what they had earned, and Allah has already forgiven them. Indeed, Allah is Forgiving and Forbearing} (Surah Aal Imran 3:155) he said: Among them was Uthman ibn Affan, and Sa'id ibn Uthman, and Alqamah ibn Uthman, both Ansaris. He said they reached a mountain in the vicinity of Medina, in the valley of al-A'was, and stayed there for three days. Iktikaf ibn Ishaq narrated it in his Musnad with his interpolation, and from his statement, then the rest of Ibn Ishaq's words in al-Maghazī.

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Reference: Al-Isaabah Fi Tamyeez al-Sahaabah Book 3

Hadith No: 3
Ibn Hajar al-Asqalani - Al-Matalib al-Aliyah bi-Zawa'id al-Masanid al-Thamaniyah
Book of Seerah and Maghazis - Chapter on the Battle of Uhud
Volume: (17) - Page Number: (347)
[The text is lengthy, so only the relevant excerpt is provided here]
4260 - And with this chain to al-Zubayr, who said: "By Allah, drowsiness was about to overcome me when I heard Ibn Qushayr say it, and I could only hear it from him as if in a dream." Then he recited: {Indeed, those who turned back among you on the day the two armies met were led astray by Satan because of some of what they had earned. And Allah had certainly forgiven them. Indeed, Allah is Forgiving and Forbearing} (Al-Imran 3:155). He said, and those who turned back during the skirmish of the people were Uthman ibn Affan, and Sa'id ibn Uthman al-Zurqi, and his brother Uqbah ibn Uthman, until they reached a mountain near Medina called al-Jal'ab in the valley of al-Aws. They stayed there for three days, and it was said that when they returned to the Messenger of Allah (peace be upon him), he said: "You have gone in it a considerable distance..."

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Reference: Al-Mataaleb al-Aaleyah BeZawaaed al-Masaaneed al-Samaaneyah Book 17