Sahih Al Bukhari – Book of Call To Prayers (Adhaan)

Volumn 001, Book 011, Hadith Number 645.
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Narated By Aiyub : Abu Qilaba RA said, "Malik bin Huwairith RA came to this Mosque of ours and said, 'I pray in front of you and my aim is not to lead the prayer but to show you the way in which the Prophet PBUH used to pray.' " I asked Abu Qilaba,"How did he use to pray?' " He replied, "(The Prophet used to pray) like this Sheikh of ours and the Sheikh used to sit for a while after the prostration, before getting up after the first Rak'a."