Probably the closest. I'll leave that one open as a possibility...How bout 1 John 5:14-17
1 John 5:14-17 NASB
[14] This is the confidence which we have before Him, that, if we ask anything according to His will, He hears us. [15] And if we know that He hears us in whatever we ask, we know that we have the requests which we have asked from Him. [16] If anyone sees his brother committing a sin not leading to death, he shall ask and God will for him give life to those who commit sin not leading to death. There is a sin leading to death; I do not say that he should make request for this. [17] All unrighteousness is sin, and there is a sin not leading to death.
But it seems to be speaking of a 'brother'.