Discovery Box1 Corinthians 9:17 
Context9:17 For if I do this voluntarily, I have a reward. But if I do it unwillingly, I am entrusted with a responsibility.
1 Corinthians 15:31
Context15:31 Every day I am in danger of death! This is as sure as 1 my boasting in you, 2 which I have in Christ Jesus our Lord.
1 tn Or, more literally, “I swear by the boasting in you.”
2 tc ‡ Although the witnesses for the shorter reading (Ì46 D F G Ψ 075 0243 1739 1881 Ï) are not as strong as for the addition of ἀδελφοί (adelfoi, “brothers”) at this juncture (א A B K P 33 81 104 365 1175 2464 lat sy co), it is difficult to find a reason why scribes would either intentionally or unintentionally drop the address here. Thus, the shorter reading is slightly preferred.
