Musannaf Ibn Abi Shayba 33:62

Waki’ narrated to us, he said: Sufyan narrated to us, from ‘Ata’ ibn Abi Marwan al-Aslami, from his father, from Ka’b, who said: Musa said: "O my Lord, are You near, so that I may speak to You privately, or are You far, so that I may call out to You?" He said: "O Musa, I am the companion of whoever remembers Me." He said: "O my Lord, we are in states in which we deem it too great or too majestic to remember You in them." He said: "And what are they?" He said: "Janabah (major ritual impurity) and the privy." He said: "O Musa, remember Me in every state."