Hadith No: 1
Al-Salahi al-Shami - Sabil al-Huda wa'l-Rashad fi Sirat Khayr al-Ibad
The Complete Collection of the Chapters on the Campaigns in which the Messenger of Allah (peace be upon him and his holy progeny) Himself Participated
Chapter Seven: Clarification of the Battle of Badr al-Kubra - Notes
Volume: (4) - Page Number: (90)
[The text is lengthy, so only the relevant excerpt is provided here]
- .... It is also said that what is meant is that their sins will be considered forgiven if they occur, and it is said that this is a testimony to the non-occurrence of sins from them. There is, however, a clear objection to this in the story of Qudamah ibn Mujadhdhin when he drank alcohol during the days of Umar, taking it as a mistaken interpretation of the command. As a result, he migrated because of this, and Umar saw in a dream someone commanding him to reconcile with him. Qudamah was among those who participated in the Battle of Badr. What can be understood from the context of the story is the second possibility, which was also understood by Abu Abd al-Rahman al-Sulami, the great Tabi'i. They agreed that the mentioned good news pertains to matters concerning the Hereafter and not to matters of this world, such as the enforcement of legal punishments and the like.

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Reference: Sobol al-Huda wa al-Rashaad fi Seerah Khair al-'Ibaad Book 4

Hadith No: 2
Al-Salahi al-Shami - Sabil al-Huda wa al-Rashad fi Seerat Khayr al-Ibad
Compilation of Chapters on the Mention of His Messengers (peace be upon him and his holy progeny) to Kings and the Like, and Mention of Some of His Correspondence and the Miracles That Occurred in This
Chapter Thirty-Four: Regarding His (peace be upon him and his holy progeny) Sending of Qudamah ibn Muz'un (may Allah be pleased with him) to al-Mundhir ibn Sawi
Volume: (11) - Page Number: (369/370)
[The text is lengthy, so only the relevant excerpt is provided here]
- .... Ibn Abd al-Barr said: Qudamah ibn Muz'un ibn Habib ibn Wahb ibn Hudhafah ibn Jumah al-Qurashi al-Jumahi was surnamed Abu Umar, and it is said he was called Abu Amr, but the first is more well-known. His mother was a woman from Banu Jumah, and he was the maternal uncle of Abdullah and Hafsah, the children of Umar ibn al-Khattab (may Allah be pleased with him and his holy progeny). He was married to Safiyyah bint al-Khattab, the sister of Umar. He emigrated to the Land of Abyssinia with his brothers: Uthman and Abdullah. He witnessed Badr and all the other battles with the Messenger of Allah (peace be upon him and his holy progeny). Umar appointed him to govern Bahrain and then removed him and flogged him for alcohol for a reason that is lengthy to explain, which Ibn Abd al-Barr mentioned. Umar then had a falling out with him but later reconciled to him due to a vision Umar had when he returned from Hajj and was staying at al-Suqiya. He slept, and when he awoke, he said: "Bring Qudamah to me quickly, for by Allah, a visitor came to me in my sleep and said: 'Heal Qudamah, for he is your brother,' so bring him to me quickly." When they brought him, he refused to come, but then he came, and Umar spoke to him and sought forgiveness for him. Ibn Abd al-Barr said: None of the people of Badr was punished for alcohol except Qudamah ibn Muz'un (may Allah be pleased with him). He died in the year thirty-six at the age of sixty-eight. Ibn Sa'd mentioned him in the accounts of his messengers (peace be upon him and his holy progeny) to al-Mundhir ibn Sawi, along with Abu Huraira (may Allah be pleased with him).

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Reference: Sobol al-Huda wa al-Rashaad fi Seerah Khair al-'Ibaad Book 11