An act with no intent

Today we will build an important foundation in Shabbat law: what happens when a person performs a permissible action on Shabbat, but from that action, a forbidden melakhah might result? Does their intention matter?

This is a fundamental dispute in the Talmud, touching upon all areas of Shabbat. Rabbi Yehuda sees the potential outcome as sufficient for liability, even without intent. Rabbi Shimon focuses on the intent itself.

How do we rule in this dispute? The major principle is that 'the Halakha follows Rabbi Shimon'. Meaning, in a case of 'Davar She'eino Mitkaven' – one is exempt. But there is an important exception.

When the undesirable outcome is certain, meaning there is no way for the melakhah not to occur, then even Rabbi Shimon agrees that one is liable. This is called 'P'sik Reisha d'Lo Yamut' (cutting off its head and it won't die).

1. 1Identify the action: Is it permissible in itself?
2. 2Evaluate the outcome: Might a forbidden melakhah result?
3. 3Check the intent: Did the person intend the forbidden melakhah?
4. 4Determine certainty: Is the melakhah certain ('P'sik Reisha') or uncertain?
5. 5Rule: If uncertain and no intent – exempt (like R. Shimon). If certain – liable (P'sik Reisha).

It is important to distinguish between 'Davar She'eino Mitkaven' and 'Mit'asek'. These are two entirely different cases, and their rulings differ.

In 'Mit'asek', there is no intention for the forbidden act, nor even for the action that caused it. It is a complete lack of intent for the act. In contrast, in 'Eino Mitkaven', the person intends the permissible action, but not the forbidden outcome that might result from it.

To reinforce our understanding, let's examine classic examples. Each example illuminates a different facet of the principle.

This example illustrates the power of intent: if his intention was for a permissible act (killing a snake), and the forbidden outcome (killing a person) is not certain – he is exempt. If his intention was for a forbidden act (killing a person), even if the actual outcome was different – he is liable for the intent.