Albert Barnes on Matthew 10:19-20

Take no thought. That is, be not anxious, or unduly solicitous. Mt 6:26. God would inspire them. This was a full promise that they should be inspired, and was a most seasonable consolation. Poor, and ignorant, and obscure fishermen would naturally be solicitous what they should say before the great men of the earth. Eastern people regarded kings as raised far above common mortals: as approaching to divinity. How consoling, then, the assurance that God would aid them, and speak within them!

(m) "But when" Mk 13:11, Lk 12:11, 21:14,15