Musannaf Ibn Abi Shayba 7:391

Ibn Fudayl narrated to us, from ‘Ata’ ibn al-Sa’ib, from Abu al-Bakhtari, from Ibn Murrah, who said: I entered the mosque while I was saying to myself that I would pray two rak’ahs at every pillar, and a man was watching me, and I did not perceive him. When I sat down, I looked, and behold, ‘Abdullah [ibn Mas’ud] was sitting. I came to him and sat beside him, and the man who was watching me was with him. He said—and he did not perceive my place—"O Abu ‘Abd al-Rahman, a man entered the mosque and began to pray two rak’ahs at every pillar." He [Ibn Mas’ud] said, "If he knew that Allah is at every pillar, he would not have moved until he had finished his prayer." He said: So I abandoned the remainder of what I had intended to pray.