מדרש על רות 2:2

“Ruth the Moavite said to Naomi: I will go to the field and glean among the stalks after one in whose eyes I find favor. She said to her: Go, my daughter” (Ruth 2:2).
“Ruth the Moavite said to Naomi: I will go to the field and glean among the stalks after one in whose eyes I find favor” – Rabbi Yannai said: She was forty years old, and only until the age of forty is one called “daughter.”
“She went, came, and gleaned in the field after the reapers; and she happened upon the portion of the field belonging to Boaz, who was from the family of Elimelekh” (Ruth 2:3).
“She went, came” – she had not even gone and you say that she came? Rabbi Yehuda ben Rabbi Simon said: She began marking the path before her.¹⁵¹She went and retraced her steps so she would be able to find her way back after gleaning. “She happened upon [vayyiker mikreha]” – Rabbi Yoḥanan said: Anyone who would see her would have a seminal emission [keri].¹⁵²Due to her great beauty. “The portion of the field…from the family of Elimelekh” – it was given to her from what was due to be her portion.¹⁵³She collected from the field of Boaz, whom she was destined to marry.