Why does a fasting person's breath smell good to Allah?
Because the smell comes from worship done for Allah alone. The Prophet ﷺ said the breath of a fasting person is better to Allah than the scent of musk. It's a way of showing how much Allah loves fasting, not a reason to skip brushing your teeth.
The hadith
The Prophet ﷺ said that Allah says: "Fasting is for Me and I will reward it," and he added, "By the One in whose hand my soul is, the smell of the mouth of a fasting person is better to Allah than the scent of musk" (Sahih al-Bukhari 1894; also Sahih Muslim 1151). In the same hadith he described fasting as a shield and said the fasting person has two joys: one when he breaks his fast and one when he meets his Lord.
The Arabic word is khuluf: the change in breath that comes from an empty stomach after hours without food or drink. Everyone who fasts gets it.
What scholars say it means
- It shows Allah's love for fasting. People find this smell unpleasant, yet Allah values it, because it's the trace of something done purely for Him. Nobody can see whether you're truly fasting; only Allah knows.
- It's about value, not a physical smell. Many scholars explain that Allah isn't like His creation, so "better to Allah" means more beloved and more rewarded, not that He smells as we do.
- Some link it to the Day of Judgement. Some narrations mention the Day of Resurrection, and scholars such as Ibn Hajar discuss whether this reward appears in this life, the next, or both.
The deeper lesson: a small thing that seems embarrassing to you can be precious to Allah when it comes from sincere worship. Fasting itself was given to grow that sincerity:
Does this mean I shouldn't brush my teeth?
No. Islam loves cleanliness, and the Prophet ﷺ encouraged the miswak (tooth stick) often. Most scholars allow brushing or using a miswak at any time of the fasting day. Some Shafi'i scholars disliked it after midday because of this very hadith, but you don't have to keep bad breath on purpose. See Can I brush my teeth while fasting?
Being considerate at work and the mosque
The hadith is about Allah's view, not an excuse to make life hard for colleagues. Brush before Fajr, use a miswak or a dry toothbrush during the day, drink plenty of water at suhoor, and avoid strong-smelling food like raw onion or garlic at suhoor before going to the mosque. See Can I eat garlic before going to the mosque?
- The fasting person's breath is better to Allah than musk (Sahih al-Bukhari 1894).
- It shows how much Allah loves sincere fasting.
- It's about reward and love, not a physical smell to Allah.
- You can still brush your teeth and use a miswak.
People also ask
Can I fast while doing a physically demanding job?
Usually yes: a hard job does not cancel the fast, but if fasting becomes unsafe you may break it and make the day up later. Tips for manual workers.
Read the full answer →How do I tell my teacher I'm fasting?
Tell your teacher you're fasting with a short, friendly note at the start of Ramadan, and ask for small adjustments for PE, rest and prayer.
Read the full answer →What is the reward for feeding a fasting person?
Feeding a fasting person earns you the same reward as their fast, without reducing theirs. The hadith, how much counts, and easy ways to do it.
Read the full answer →Are devils chained up in Ramadan?
Yes, the Prophet said devils are chained in Ramadan (Bukhari 1899). So why do people still sin? What scholars say about the nafs and habits.
Read the full answer →Can I go in a sauna while fasting?
Yes, a sauna doesn't break your fast because sweating isn't eating or drinking, but dehydration is a real risk. Steam rooms and safer timing.
Read the full answer →