Silsilat al-Ahadith al-Sahihah

It is narrated from Sayyidah Umm Salamah (may Allah be pleased with her) that the Messenger of Allah (peace and blessings be upon him) said: "After every two rak‘ahs, the Tashahhud is to be recited, and supplication for peace is to be made for the prophets and the righteous servants of Allah who follow them."