זְרַעְתֶּ֨ם הַרְבֵּ֜ה וְהָבֵ֣א מְעָ֗ט אָכ֤וֹל וְאֵין־לְשָׂבְעָה֙ שָׁת֣וֹ וְאֵין־לְשָׁכְרָ֔ה לָב֖וֹשׁ וְאֵין־לְחֹ֣ם ל֑וֹ וְהַ֨מִּשְׂתַּכֵּ֔ר מִשְׂתַּכֵּ֖ר אֶל־צְר֥וֹר נָקֽוּב׃ (פ)
Ye have sown much, and brought in little, Ye eat, but ye have not enough, Ye drink, but ye are not filled with drink, Ye clothe you, but there is none warm; And he that earneth wages earneth wages For a bag with holes.
Mishnah Makhshirin
One who immersed himself in a river and then there was in front of him another river and he crossed it, the second [water] purifies the first [water]. If his fellow pushed him in during exercise or his beast [pushed him in], the second [water] purifies the first [water]. But if [he did it] out of playfulness, it comes under the law of ‘if water be put’.