In the sixteenth incarnation of the Godhead, the Lord [as Bhṛgupati] annihilated the administrative class [kṣatriyas] twenty-one times, being angry with them because of their rebellion against the brāhmaṇas [the intelligent class].
Srimad Bhagavata Purana
श्रीमद्भागवतमहापुराणम्
मूल श्लोकः
अवतारे षोडशमे पश्यन् ब्रह्मद्रुहो नृपान् । त्रिःसप्तकृत्वः कुपितो निःक्षत्रामकरोन्महीम्
avatāre ṣoḍaśame paśyan brahmadruho nṛpān | triḥsaptakṛtvaḥ kupito niḥkṣatrāmakaronmahīm
SB 1.3.20