Musannaf Ibn Abi Shaybah

Hazrat Umar (may Allah be pleased with him) passed by a man who was sitting among the people writing. And he was making more than two witnesses. Hazrat Umar (may Allah be pleased with him) forbade him. Then after a while he passed by again (and he was doing the same thing). Hazrat Umar (may Allah be pleased with him) said, "Did I not forbid you?" The man said: "I obeyed Allah and disobeyed you." And it was regarding the charity of Hazrat Umar (may Allah be pleased with him). Hazrat Abdullah bin Arqam (may Allah be pleased with him) and Hazrat Mu'iqeeb (may Allah be pleased with him) had testified, and regarding the charity of Hazrat Ali (may Allah be pleased with him), so-and-so had testified. And he wrote it down.