6So the two of them sat and ate and drank together. And the girl’s father said to the man, “Be pleased to spend the night, and let your heart be merry.”
In Judges 19:5 the father-in-law addressed his son-in-law to stay for a meal. So the two of them is how this verse begins. Therefore, this must be a reference to the two men. The concubine is ignored.
6 So the two of them sat and ate and drank together. And the girl’s father said to the man, “Be pleased to spend the night, and let your heart be merry.”