Reference for I Samuel 25:41

וַתָּ֕קָם וַתִּשְׁתַּ֥חוּ אַפַּ֖יִם אָ֑רְצָה וַתֹּ֗אמֶר הִנֵּ֤ה אֲמָֽתְךָ֙ לְשִׁפְחָ֔ה לִרְחֹ֕ץ רַגְלֵ֖י עַבְדֵ֥י אֲדֹנִֽי׃

And she arose, and bowed down with her face to the earth, and said: ‘Behold, thy handmaid is a servant to wash the feet of the servants of my lord.’