Musnad Ahmad 27:1838

Ibn Numayr and Muhammad ibn Ubayd narrated to us, they said: Ubaydullah narrated to us, from Nafi’, from Ibn Umar, that the Messenger of Allah (may Allah bless him and grant him peace) said: "Indeed, the likeness of the hypocrite is like the confused ewe between two flocks; it wanders to this one at times, and to this one at times, not knowing which of them to follow."