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. (TR)
Reference (TR): Sahih Muslim 2784 a (TR)
In-book reference (TR): Book 51, Hadith 20 (TR)
USC-MSA web (English) reference(deprecated numbering scheme): Book 38, Hadith 6696 (TR)