Sayyiduna Abdullah bin Mas'ud (may Allah be pleased with him) said: "The Messenger of Allah (peace and blessings be upon him) used to command us that when we began the prayer we should say: 'O Allah! Glory be to You, and with Your praise; blessed is Your name, exalted is Your majesty, and there is no god besides You.'"
Hadith Referenceالمعجم الكبير للطبراني / باب العين / 10242