NET
6 So the Lord replied, “If you had faith the size of a mustard seed, you could say to this black mulberry tree, ‘Be pulled out by the roots and planted in the sea,’ and it would obey you.
Darby
6 But the Lord said, If ye have faith as a grain of mustard [seed], ye had said to this sycamine tree, Be thou rooted up, and be thou planted in the sea, and it would have obeyed you.
KJV
6 And the Lord said, “If ye had faith as a grain of mustard seed, ye might say unto this sycamine tree, Be thou plucked up by the root, and be thou planted in the sea; and it should obey you.”