Musannaf Ibn Abi Shayba 33:268

Husayn ibn Ali narrated to us, he said: Tu'mah ibn Ghaylan al-Ju'fi narrated to me, from a man who is called Mika'il, an elder from the people of Khurasan, he said: When Umar would stand at night, he would say: "You see my station and You know my need, so return me from You, O Allah, with my need, successful, prosperous, one who is answered, and one for whom it is answered, having forgiven me and had mercy upon me." And when he finished his prayer, he would say: "O Allah, I do not see anything of the world that lasts, and I do not see a state in it that remains upright. Make me speak in it with knowledge and remain silent in it with wisdom. O Allah, do not increase for me of the world so that I become insolent, and do not decrease for me from it so that I forget. For that which is little and suffices is better than that which is much and distracts."