וְכִֽי־יִפְתַּ֨ח אִ֜ישׁ בּ֗וֹר א֠וֹ כִּֽי־יִכְרֶ֥ה אִ֛ישׁ בֹּ֖ר וְלֹ֣א יְכַסֶּ֑נּוּ וְנָֽפַל־שָׁ֥מָּה שּׁ֖וֹר א֥וֹ חֲמֽוֹר׃
사람이 구덩이를 열어 두거나 구덩이를 파고 덮지 아니함으로 소나 나귀가 거기에 빠지면
Rashi on Exodus
וכי יפתח איש בור AND IF A MAN SHALL OPEN A PIT which was covered over, and he now uncovered it.
Or HaChaim on Exodus
וכי יפתח איש בור, If a man shall open a pit, etc. This means that even if an ox or donkey fell upon the person digging the pit, not only being killed itself but also killing the owner (digger) of the pit, the owner of the pit (or in this case his estate), must pay compensation to the owner of the animal which tripped and was killed although it caused the death of the owner of the pit (compare Erchin 7).
Rashbam on Exodus
וכי יפתח איש בור, one which was already deep enough to cause fatal harm to animals when not covered; when the owner deepened it further, his sin being that he did not cover it to render it harmless. כי יכרה איש בור, or even if the man in question only digs a hole and fails to cover it at the end of the day, seeing he did not complete it until the following day, and he considered it too much bother to put a temporary cover on it pending his completing his excavation, he is held responsible for any damage thus caused.