I heard that in the case of tefillin falling on the floor, this is a serious thing and one must give $25 in tzedaka. I did a little research and found that halacha offers an alternative option of fasting.
If the Tefillin fell on the floor two days before a fast day - for example, the 17th of Tammuz - but it is too late to accept a fast for Mincha prior to the 16th of Tammuz, there are three possible methods of doing this. Which are acceptable?
- Fasting tomorrow [16 Tammuz] dawn till dusk, eating, and repeating for the 17th of Tammuz
- Designating a day several days after the 17 of Tammuz to fast
- Fasting once on the 17th of Tammuz (this is especially relevant in a case where there was no time to accept a fast for Mincha of the 15th of Tammuz, and thus the 17th may be considered the first available opportunity to fast).