חוֹמָה֙ הָי֣וּ עָלֵ֔ינוּ גַּם־לַ֖יְלָה גַּם־יוֹמָ֑ם כָּל־יְמֵ֛י הֱיוֹתֵ֥נוּ עִמָּ֖ם רֹעִ֥ים הַצֹּֽאן׃
they were a wall unto us both by night and by day, all the while we were with them keeping the sheep.
Read kabbalistic (mystical) interpretation of I Samuel 25:16: and classical mystical sources.