Parallel
2 Timothy 2:5
Nestle 1904 Greek New Testament · Berean Standard Bible
ἐὰν δὲ καὶ ἀθλῇ τις οὐ στεφανοῦται ἐὰν μὴ νομίμως ἀθλήσῃ
Likewise, a competitor does not receive the crown unless he competes according to the rules.