Musannaf Ibn Abi Shaybah 37660 — The words of Abu Razin

It is narrated from al-Harith bin Qays that he said: When you are engaged in some worldly affair, hurry; and when you are engaged in some matter of the Hereafter, stay as long as you can. And when you are praying and Satan comes to you and says: "You are showing off," then (all the same) make your prayer even longer.