1 Corinthians 10:9
“Neither let us tempt Christ, as some of them also tempted, and perished by serpents.”
By this he again hints at another charge which he likewise states at the end, blaming them because they contended about signs. And indeed they were destroyed on account of trials, saying, “when will the good things come? When the rewards?” Wherefore also he adds, on this account correcting and alarming them,
Source: Homilies on First Corinthians (New Advent)