The seeds on rocky ground are those who hear the word and receive it with joy, but they have no root. They believe for a season, but in the time of testing, they fall away.
KJV
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.
ASV
And those on the rock are they who, when they have heard, receive the word with joy; and these have no root, who for a while believe, and in time of temptation fall away.