NET
13 Those on the rock are the ones who receive the word with joy when they hear it, but they have no root. They believe for a while, but in a time of testing fall away.
Darby
13 But those upon the rock, those who when they hear receive the word with joy; and these have no root, who believe for a time, and in time of trial fall away.
KJV
13 “They on the rock” [are they], “which, when they hear, receive the word with joy; and these have no root, which for a while believe, and in time of temptation fall away.”