Sayyidah Sudaysah (may Allah be pleased with her), the freed slave-woman of Hafsah (may Allah be pleased with her), said: The Messenger of Allah (peace and blessings be upon him) said: "Ever since Umar (may Allah be pleased with him) accepted Islam, whenever Satan meets him, he falls on his face."
Hadith Referenceالمعجم الكبير للطبراني / مسند النساء / 21144