Musannaf Ibn Abi Shaybah

Hazrat Abu Qalabah says that if a person says, "I have fasts of one month upon me," then he knows best what he has said, and his intention is to be considered (it will be based on his intention).

Hazrat Hammad and Ibrahim state that if a person makes a vow that he has to fast for one month, and does not specify any particular month, then if he wishes, he may fast consecutively, and if he wishes, he may fast on separate days.

Hazrat Maymoon says that if the vow is of fasting, then they will be observed consecutively.

Hazrat Hajjaj says that I asked Hazrat Ata, and the person who had asked Ibrahim told me: If a person makes a vow that he must fast for a month, both said: He will fast thirty days, that is, it is not necessary to keep them consecutively.