Saul sent messengers to take David: and when they saw the company of the prophets prophesying, and Samuel standing as head over them, the Spirit of God came on the messengers of Saul, and they also prophesied.
Saul lost the privilege of reigning, he became a vessel unto dishonor, he created problems for others, and he eventually destroyed himself. Another Saul, Saul of Tarsus, perhaps learning from the experiences of Saul of Gibeah, who may have been his namesake, feared the possibility that he might similarly disqualify himself (1 Corinthians 9:27). We must not confuse disqualification from service with loss of salvation. The former is possible for every believer, but the latter is not (cf. Romans 8:31-39).