SB 4.19.26

tad abhijñāya bhagavān
 pṛthuḥ pṛthu-parākramaḥ
indrāya kupito bāṇam
 ādattodyata-kārmukaḥ
Synonyms: 
tat — that; abhijñāya — understanding; bhagavān — the incarnation of Godhead; pṛthuḥ — King Pṛthu; pṛthu-parākramaḥ — celebrated as very powerful; indrāya — upon Indra; kupitaḥ — being very angry; bāṇam — an arrow; ādatta — took up; udyata — having taken up; kārmukaḥ — the bow.
Translation: 
Mahārāja Pṛthu, who was celebrated as very powerful, immediately took up his bow and arrows and prepared to kill Indra himself, because Indra had introduced such irregular sannyāsa orders.
Purport: 

It is the duty of the king not to tolerate the introduction of any irreligious systems. Since King Pṛthu was an incarnation of the Supreme Personality of Godhead, certainly his duty was to cut down all kinds of irreligious systems. Following in his footsteps, all heads of state should themselves be bona fide representatives of God and should cut down all irreligious systems. Unfortunately they are cowards who declare a secular state. Such a mentality is a way of compromising religious and irreligious systems, but because of this citizens are generally becoming uninterested in spiritual advancement. Thus the situation deteriorates to such an extent that human society becomes hellish.