Hadith #3828 (Sahih al-Bukhari)
Book: Military Expeditions led by the Prophet (pbuh) (Al-Maghaazi)
Narrator(s): Mu'adh bin Rifa'a bin Rafi' bin Malik معاذ بن رفاعة الزرقي
Grade: Sahih

Rifa`a was one of the warriors of Badr while (his father) Rafi` was one of the people of Al-`Aqaba (i.e. those who gave the pledge of allegiance at Al-`Aqaba). Rafi` used to say to his son, “I would not have been happier if I had taken part in the Badr battle instead of taking part in the ‘Aqaba pledge.”

Source: https://parallelquran.com/hadith/sahih-al-bukhari-3828/

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Hadith #931 (Sunan al-Nasa'i)
Book: The Book of the Commencement of the Prayer
Narrator(s): Mu'adh bin Rifa'a bin Rafi' bin Malik معاذ بن رفاعة الزرقي, Qutayba bin Sa'id bin Jamil قتيبة بن سعيد بن جميل, Rifa'a bin Rafi' bin Malik bin al-'Ajlan

The Messenger of Allah (ﷺ) said: “When the Imam says: Not (the way) of those who earned Your anger, nor of those who went astray, say: ‘Amin,’ for if a person’s Amin coincides with the Amin of the angels, his previous sins will be forgiven.'”

Source: https://parallelquran.com/hadith/sunan-al-nasai-931/