1 Corinthians 10:9-12

We must not tempt the Lord [that is, test His patience, question His purpose or exploit His goodness], as some of them did—and they were killed by serpents. [Num 21:5, 6] And do not murmur [in unwarranted discontent], as some of them did—and were destroyed by the destroyer. [Num 16:41, 49] Now these things happened to them as an example and warning [to us]; they were written for our instruction [to admonish and equip us], upon whom the ends of the ages have come. Therefore let the one who thinks he stands firm [immune to temptation, being overconfident and self-righteous], take care that he does not fall [into sin and condemnation].