Sahih Muslim
Characteristics of The Hypocrites And Rulings Concerning Them
كتاب صفات المنافقين وأحكامهم
Ibn Umar reported Allah's Apostle (ﷺ) as saying
The similitude of a hypocrite is that of a sheep which roams aimlessly between two flocks. She goes to one at one time and to the other at another time.
Jabir b. Abdullah reported Allah's Messenger (ﷺ) as saying
He who would climb this hill of Murar. The rest of the hadith is the same but with this variation that it was a desert Arab who was finding out his lost thing.