Luke 8:8, 13

And some fell into good soil, and grew up and produced a crop a hundred times as great.” As He said these things, He called out, “He who has ears to hear, let him hear and heed My words.”

Those on the rocky soil are the people who, when they hear, receive and welcome the word with joy; but these have no firmly grounded root. They believe for a while, and in time of trial and temptation they fall away [from Me and abandon their faith].