Ruth 2:11

‘ And Boaz answered and said to her, “It has fully been shown me, all that you have done for your mother-in-law since the death of your husband, and how you have left your father and your mother, and the land of your nativity, and are come to a people whom you knew not up until now.”

We are not given the source of his information, which was probably one of his servants whom he had sent to enquire into Naomi's general welfare, but he now makes clear that he is aware of almost the full story of what had happened. He knew something of what she had done for Naomi after the death of her own husband, and how she had left her own family, and the land of her birth, so as to come with Naomi among what to her had, up to this time, been a strange people. He had also seemingly learned of her devotion to YHWH. This may have become common knowledge as Naomi had spoken with her fellow citizens, or it may have been information obtained from Naomi herself as a result if his kindly enquiries.,