Luke 8:13
Those on the rocky ground 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 the time of testing they fall away — the rocky ground people believe for a while — Luke's they believe for a while is more specific than Mark's they believe. The time of testing (en kairō peirasmou, in the season of trial) is when the rootless faith collapses.