Assalam o Alaikum I was doing my sehri in other room and thought sehri ending timing was 4:54 and it was actually 4:48. and i kept eating till 4:49. By brother told me that time has ended when he saw me drinking water. I immediately stopped. Is my roza still valid?
I would have liked somebody to find a published answer somewhere but I didn't find any, as well as others who have looked into your question.
There are enough aspects that speak in favour of your fast being valid:
- You had the intention to fast correctly at the time you had in mind.
- It's just a minute. Precision of time resolution in the period when the criteria were pronounced was 15 minutes at best. Even modern algorithms differ in more than 1 minute.
- As your time is similar to mine, you are probably somewhere without a public call. Your brother has made the call and you listened.
Each criterion may be a reason that can be discussed whether that's valid on it's own.
Altogether, your fasting is so close to perfect that I don't see a reason to think that it is invalid.