Musannaf Ibn Abi Shaybah

Ibrahim says that if someone swears an oath like this: "On the day I do such-and-such work, I will be in the state of ihram for Hajj," then when he breaks his oath, he will become a muhrim (one in ihram). And if he swears an oath like this: "If I do such-and-such work, I will be in the state of ihram for Hajj," and the month of Shawwal has already begun, then he will be considered a muhrim.

Hazrat Sha'bi says that if a person says, "If I have done such and such deeds, then I am in the state of Ihram for Hajj," then (after being proven false) he will perform Hajj with the people.

It is narrated in the same way from Hazrat Sha'bi.

Hazrat Hakam states that if a person says, "On the day I did such-and-such act, I was in the state of ihram for Hajj," then if he is proven false, he will be considered as having been in the state of ihram for Hajj on that day. And if he says, "If I did not do such-and-such acts, then I will be in the state of ihram for Hajj," then if, after being proven false, he performs Hajj with the people, it will suffice.