Here are Scripture Witnesses to 1John 5: 16-17, there are more but this should help you to find them. I used Nelson (NKJV) Bible margin and then e-sword to cross reference. Job 42:8 (MKJV)And now take to yourselves seven young bulls and seven rams, and go to My servant Job, and offer up for yourselves a burnt offering.
And My servant Job will pray for you. Surely I will lift up his face so as not to do with you according to your foolishness, in that you have not spoken of Me what is right, like My servant Job. Jer 14: 10-12 (MKJV)10 So says Jehovah to this people; So they have loved to wander; they have not restrained their feet; therefore Jehovah does not accept them. He will now remember their iniquity and visit their sins.
11
Then Jehovah said to me, Do not pray for this people for good. 12 When they fast, I will not hear their cry; and when they offer burnt offering and a grain offering, I will not accept them. But I will consume them by the sword, and by the famine, and by the plague.
Mat 12: 31-32 (LITV)31 Because of this, I say to you,
Every sin and blasphemy shall be forgiven to men,
but the blasphemy concerning the Spirit shall not be forgiven to men. 32
And whoever speaks a word against the Son of Man, it shall be forgiven him. But whoever speaks against the Holy Spirit, it shall not be forgiven him, not in this age nor in the coming one.
george.