Hadith 1089:13
Yazid narrated to us, Hammad ibn Salamah informed us, from Ali ibn Zayd, from Abu Uthman al-Nahdi, who said: We were with Salman under a tree, and he took a branch from it and shook it, and its leaves fell off. He said: "Will you not ask me why I did that?" We said: "Tell us." He said: We were with the Messenger of Allah, peace and blessings of Allah be upon him, in the shade of a tree, and he took a branch from it and shook it, and its leaves fell off. He said: "Will you not ask me why I did that?" We said: "Tell us, O Messenger of Allah." He said: "Indeed, when the Muslim servant stands for prayer, his sins fall away from him just as the leaves of this tree fall away."
حدثنا يزيد، أخبرنا حماد بن سلمة، عن علي بن زيد، عن أبي عثمان النهدي، قال: كنا مع سلمان تحت شجرة فأخذ غصنا منها فنفضه فتساقط ورقه فقال: ألا تسألوني عما صنعت؟ فقلنا: أخبرنا فقال: كنا مع رسول الله صلى الله عليه وسلم في ظل شجرة فأخذ غصنا منها فنفضه فتساقط ورقه، فقال: " ألا تسألوني عما صنعت؟ " فقلنا: أخبرنا يا رسول الله، فقال: " إن العبد المسلم إذا قام إلى الصلاة، تحاتت عنه خطاياه كما تحات ورق هذه الشجرة "