Musannaf Ibn Abi Shaybah

Hazrat Taislah narrates that Hazrat Abdullah bin Umar (may Allah be pleased with them both) said: Whoever, after performing the prayer, remains seated in his place and recites these words: Allah is the Greatest, as many times as odd and even numbers, and Allah’s words are complete, pure, and full of blessings. Three times. And there is no deity except Allah, three times. Then these words will become light for that person in the grave, and light on the Bridge of Sirat, until he is admitted into Paradise, or he said: he will enter Paradise.