If someone sins against a man, God will mediate for him, but if someone sins against YAHWEH, who can intercede for him?

1 Samuel 2:25

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Do not be afraid; you have done all this evil. Yet do not turn aside from following YAHWEH, but serve YAHWEH with all your heart. And do not turn aside after empty things that cannot profit or deliver, for they are empty. For YAHWEH will not forsake his people, for his great name's sake, because it has pleased YAHWEH to make you a people for himself.

1 Samuel 12:20-22

 For your name's sake, O YAHWEH,
   pardon my guilt, for it is great.

Psalm 25:11