Two companions of Sayyiduna Abdullah bin Mas'ud (may Allah be pleased with him) narrate that they used to bring their heads close to Sayyiduna Abdullah (may Allah be pleased with him) so that they could hear what he said in his prostration. One of them said: I heard him saying: "Glory be to You; there is no deity besides You." And the other said: I heard him saying: "Glory be to You; there is no lord besides You."
Hadith Referenceالمعجم الكبير للطبراني / باب العين / 9135