The Muslim should not speak of anything except that which he knows for certain, and he should avoid speaking on the basis of speculation, conjecture and possibilities, except within the limits dictated by interests, when one may sometimes speak in that manner.

If you intended to fast `Ashura but you didn’t fast deliberately, you will not get any reward. If you forgot to fast `Ashura, we hope you will get rewarded. If you didn’t fast `Ashura because of sickness, we hope you will get rewarded.