3 occurrences across the corpus

Apostolic Fathers

Ignatius to Polycarp 1:6

Speak to every one according as God shall enable thee. Bear the infirmities of all, as a perfect combatant; where the labour is great, the gain is the more.

Ignatius to Polycarp 1:12

Be sober as the combatant of God: the crown proposed to thee is immortality, and eternal life; concerning which thou art also fully persuaded. I will be thy surety in all things, and my bonds, which thou hast loved.

Ignatius to Polycarp 1:14

It is the part of a brave combatant to be wounded, and yet overcome. But especially we ought to endure all things for God's sake, that he may bear with us.