After hearing Abigail's wise appeal, David immediately recognizes the truth in her words and senses a higher power at work. His response goes beyond simple thanks to her; it becomes a profound expression of gratitude to God for the personal providence that kept him from committing a terrible wrong.
The primary approach among commentators is that David blesses God because he understands this entire encounter was orchestrated to stop him from killing Nabal. He acknowledges that it was God who placed the initiative into Abigail's spirit and heart to come out and meet him [רד״ק, מלבי״ם]. In doing so, David fully accepts Abigail's earlier claim, confirming that it is indeed God who has held him back from shedding blood [אברבנאל].
Amidst this moment of divine recognition, the written record of Abigail's name appears in a slightly shortened form. While this might normally be viewed as a simple variation in biblical spelling, Midrashic tradition uncovers a hidden layer of criticism. Earlier in their exchange, Abigail had asked David to keep her in mind for the future, subtly hinting at a potential relationship while she was still a married woman. To reflect this slight moral lapse in her conduct at that moment, a letter is dropped from her name [מנחת שי, רד״ק].