Musnad Ahmad 523:0

Narrated Hanzalah al-Katib al-Usaydi: He said: I met Abu Bakr, and he said: "How are you, Hanzalah?" I said: "Hanzalah has become a hypocrite." He said: "Glory be to Allah! What are you saying?" I said: "We are with the Messenger of Allah (peace be upon him), and he reminds us of the Fire and the Garden until it is as if we are seeing them with our own eyes. But when we depart from the Messenger of Allah (peace be upon him), we attend to our wives, our children, and our properties, and we forget much." Abu Bakr said: "By Allah, we experience the same." So I went, along with Abu Bakr, until we entered upon the Messenger of Allah (peace be upon him). I said: "Hanzalah has become a hypocrite, O Messenger of Allah." The Messenger of Allah (peace be upon him) said: "And what is that?" I said: "O Messenger of Allah, we are with you, and you remind us of the Fire and the Garden until it is as if we are seeing them with our own eyes. But when we depart from you, we attend to our wives, our children, and our properties, and we forget much." The Messenger of Allah (peace be upon him) said: "By Him in Whose hand is my soul, if you were to continue in the state you are in when you are with me, and in the state of remembrance, the angels would shake hands with you in your beds and on your paths. But, O Hanzalah, there is a time for this and a time for that." He said it three times.