"In the year that King Uzziah died, I saw the Lord seated on a throne, high and exalted, and the train of his robe filled the temple. Above him were seraphs, each with six wings: With two wings they covered their faces, with two they covered their feet, and with two they were flying. And they were calling to one another:
"Holy, holy, holy is the LORD Almighty;
the whole earth is full of his glory."
At the sound of their voices the doorposts and thresholds shook and the temple was filled with smoke.
"Woe to me!" I cried. "I am ruined! For I am a man of unclean lips, and I live among a people of unclean lips, and my eyes have seen the King, the LORD Almighty." Then one of the seraphs flew to me with a live coal in his hand, which he had taken with tongs from the altar. With it he touched my mouth and said, "See, this has touched your lips; your guilt is taken away and your sin atoned for."
Isaiah 6:1-7, an unnamed seraph takes away Isaiah's sin
This is another passage describing the atoning act of an angel. Unless this is also Jesus, atonement can be granted by angels and of course directly from the Lord who never despises a contrite heart.
"Then I heard the voice of the Lord saying, 'Whom shall I send? And who will go for us?'
And I said, 'Here am I. Send me!'"