A  ¹⁶ If anyone sees his brother sinning a sin which does not lead to death,

B  he will ask,

C  and He will give him life for those who commit sin not leading to death.

C’  There is sin leading to death.

B’  I do not say that he should pray about that.

A’  ¹⁷ All unrighteousness is sin, and there is sin not leading to death.

A: Sinning not leading to death.
B:  Ask/Pray.
C: Life or Death.