If one made no formal fast acceptance but ate nothing all day (derech ta'anit), is the fasting credited as a vow-obligation, and does one say Aneinu?

Does mental intention (harhur) to fast the next day, expressed without verbalization, constitute valid acceptance of a fast (kabbalat ta'anit)?

4 opinions

May one recite Aneinu (the special fast-day prayer insertion) if one accepted the fast only through mental intention rather than verbal declaration during afternoon prayer?

2 opinions

Does one incur an obligation to fast if the fast was accepted only by mental intention outside of the prescribed time, without formal verbal acceptance?

3 opinions

If one accepted a fast outside of afternoon prayer time (in the morning or earlier in the day), is this acceptance valid?

1 opinions