חֹפֵ֥ר גּוּמָּ֖ץ בּ֣וֹ יִפּ֑וֹל וּפֹרֵ֥ץ גָּדֵ֖ר יִשְּׁכֶ֥נּוּ נָחָֽשׁ׃
El que hiciere el hoyo caerá en él; y el que aportillare el vallado, morderále la serpiente.
Jerusalem Talmud Sheviit
Rebbi Simeon ben Ioḥai was travelling in the Sabbatical when he saw somebody collecting Sabbatical [produce]35This is explained in Berakhot1:2, Note 130. Parallels are in Midrash Gen.rabba 79(6), Eccl.rabbati 10(11).. He said to him, is this not forbidden, is that not spontaneous growth? He said to him, are not you the one who permits it? He said to him, are not my colleagues disagreeing with me? He read for him (Eccl. 10:8): “He who tears down a fence36“Making a fence” is the usual metaphor for a rabbinic prohibition. Even if the Sabbatical is to be observed as biblical commandment, spontaneous growth is forbidden only by rabbinical decree. will be bitten by a snake.” That is what happened to him.
Jerusalem Talmud Avodah Zarah
133Babli 27b. According to this source, ben Dama was the son of R. Ismael’s sister. It happened that Eleazar ben Dama was bitten by a snake and Jacob from Kefar-Sama came to heal him (,and told him, I shall speak to you)134Addition in the text here. in the name of Jesus ben Pandera. Rebbi Ismael said to him, Ben Dama you are not allowed. He told him, I shall bring a proof that he can heal me. He could not bring proof before he died. Rebbi Ismael said to him, you are blessed, ben Dama, that you left this world in peace and did not tear down the fences of the Sages, (to confirm)134Addition in the text here. as it is written135Eccl. 10:8. The fence is a stone wall without mortar with holes in which a snake may hide., he who tears down a fence will be bitten by a snake. But did not a snake bite him? But that it will not bite him in the Future World136The mythical snake which seduced Eve.. What could he have said? Which a person should do and live by them137Lev. 18:5..
Avot DeRabbi Natan
He would also say: Someone who looks at his wife and wishes that she will die so that he can inherit [from] her, or that she will die so that he can marry her sister, or someone who looks at his brother and wishes that he will die so that he can marry his [brother’s] wife, in the end he will be buried during their lifetimes. About such a person Scripture says (Ecclesiastes 10:8), “One who digs a pit will fall into it; one who breaks through a fence will be bitten by a snake.”