1 Samuel 25:40
And when the servants of David were come to Abigail to Carmel, they spake unto her, saying, David sent us unto thee, to take thee to him to wife. And when the servants of David were come to Abigail to Carmel, they spake unto her, saying, David sent us unto thee, to take thee to him to wife.
David's sending of his servants to Abigail at Carmel to take her to him as wife took place after Saul killed the Lord's priests. In that slaughter Abiathar alone escaped and fled to join David. David received him and promised him safety with himself.