Sayyiduna Abdullah bin Malik (may Allah be pleased with him) said: The Messenger of Allah (peace and blessings be upon him) led us in two rak'ahs of one of the prayers, then he (peace and blessings be upon him) stood up without sitting, and the people praying also stood up with him (peace and blessings be upon him). When he (peace and blessings be upon him) had completed the prayer and we were waiting for him to give the salam, he (peace and blessings be upon him) said the takbir and performed two prostrations before giving the salam, then he gave the salam.
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الصلاة / 3813