מדרש על רות 2:7

“She said: Please let me glean and gather after the reapers among the sheaves; so she came, stood from the morning until now, she sat in the house only a bit” (Ruth 2:7).
“She said: Please let me glean and gather…among the sheaves…a bit” – she took only a bit, [which was insufficient even] for herself; how much more so [was it insufficient] for the one sitting in the house waiting for her [Naomi].