en_tn_lite_do_not_use/mat/21/21.md

Truly I say to you

"I tell you the truth." This phrase adds emphasis to what Jesus says next.

if you have faith and do not doubt

Alternate translation: "if you truly believe"

you will even say to this mountain, 'Be taken up and thrown into the sea,'

Alternate translation: "you will even be able to tell this mountain to get up and throw itself into the sea,"