Sayyiduna Abdullah bin Mas'ud (may Allah be pleased with him) narrates: The Messenger of Allah (peace and blessings be upon him) taught us the prayer. He (peace and blessings be upon him) said the takbir, and when he intended to bow he joined his palms together and placed them between his knees (tatbiq). When this reached Sayyiduna Sa'd bin Abi Waqqas (may Allah be pleased with him), he said: "My brother has spoken the truth. We used to do this, but later we were commanded to hold the knees." This hadith is sahih (authentic) on the condition of Imam Muslim, but they did not record it in this form, although the two Shaykhs agreed upon its meaning.