וַתְּלַקֵּ֥ט בַּשָּׂדֶ֖ה עַד־הָעָ֑רֶב וַתַּחְבֹּט֙ אֵ֣ת אֲשֶׁר־לִקֵּ֔טָה וַיְהִ֖י כְּאֵיפָ֥ה שְׂעֹרִֽים׃
So she gleaned in the field until even; and she beat out that which she had gleaned, and it was about an ephah of barley.
Read kabbalistic (mystical) interpretation of Ruth 2:17: and classical mystical sources.