Sunan an-Nasa'i 5037

أَخْبَرَنَا قُتَيْبَةُ قَالَ حَدَّثَنَا يَعْقُوبُ عَنْ مُوسَى بْنِ عُقْبَةَ عَنْ نَافِعٍ عَنْ ابْنِ عُمَرَ أَنَّ رَسُولَ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ قَالَ مَثَلُ الْمُنَافِقِ كَمَثَلِ الشَّاةِ الْعَائِرَةِ بَيْنَ الْغَنَمَيْنِ تَعِيرُ فِي هَذِهِ مَرَّةً وَفِي هَذِهِ مَرَّةً لَا تَدْرِي أَيَّهَا تَتْبَعُ

It was narrated from Ibn 'Umar that :The Messenger of Allah [SAW] said: "The parable of the hypocrite is that of a sheep that hesitates between two flocks, sometimes following one, and sometimes following another, not knowing which to follow

Reference

Sunan an-Nasa'i 5037

In-book

Book 47, Hadith 53