Narrated Ibn `Umar: The Prophet saw expectoration in the direction of the Qibla of the mosque while he was leading the prayer, and scratched it off. After finishing the prayer, he said, "Whenever any of you is in prayer he should know that Allah is in front of him. So none should spit in front of him in the prayer."
Hadith Referenceصحيح البخاري / كتاب الأذان (صفة الصلوة) / 753
Hadith Gradingمحدثین:أحاديث صحيح البخاريّ كلّها صحيحة
Narrated Ibn `Umar: The Prophet used to deliver his sermons while standing beside a trunk of a datepalm. When he had the pulpit made, he used it instead. The trunk started crying and the Prophet went to it, rubbing his hand over it (to stop its crying).
Hadith Referenceصحيح البخاري / كتاب المناقب / 3583
Hadith Gradingمحدثین:أحاديث صحيح البخاريّ كلّها صحيحة