GOD'S WORD® Translation
Since he doesn't have any root, he lasts only a little while. When suffering or persecution comes along because of the word, he immediately falls [from faith].

American Standard Version
yet hath he not root in himself, but endureth for a while; and when tribulation or persecution ariseth because of the word, straightway he stumbleth.

Berean Study Bible
But since he has no root, he remains for only a season. When trouble or persecution comes because of the word, he quickly falls away.

Douay-Rheims Bible
Yet hath he not root in himself, but is only for a time: and when there ariseth tribulation and persecution because of the word, he is presently scandalized.

English Revised Version
yet hath he not root in himself, but endureth for a while; and when tribulation or persecution ariseth because of the word, straightway he stumbleth.

King James Bible
Yet hath he not root in himself, but dureth for a while: for when tribulation or persecution ariseth because of the word, by and by he is offended.

World English Bible
yet he has no root in himself, but endures for a while. When oppression or persecution arises because of the word, immediately he stumbles.

Young's Literal Translation
and he hath not root in himself, but is temporary, and persecution or tribulation having happened because of the word, immediately he is stumbled.

Matthew 13:21 Additional Translations ...