Reference: Musnad of Imaam Ahmad – Volume 3, Page 198; at-Tirmidhee – The Book of the description of the Day of Judgement, Volume 4, Page 569, Number 2499;
Ibn Maajah – The Book of Abstention, Chapter – The mention of repentance;
ad-Daarimee – The Book of ar-Riqaaq, Chapter – Repentance;
Sharhus-Sunnah of al-Baghawee – Volume 5, Page 92;
al-Hilyah of Abu Naeem – Volume 6, Page 332; Kashful-Khafaa of al-Ajloonee. – Volume 2, Page 120;
al-Mustadrak of al-Haakim – Volume 4, Page 273, where it mentions: This hadeeth has a sound chain of narrators and they (al-Bukhaaree and Muslim) have not transmitted it;
Sharhus-Sunnah of al-Baghawee – Volume 2, Page 120 where it mentions: Its chain of narrators is strong.
The Messenger of Allaah (sal-Allaahu ‘alayhi wa sallam) said:
All of the children of Aadam make mistakes, and the best of them are those who repent.