Islamic phrase · meaning and usage
Allahu A'lam meaning
Also written Allahu a'lam, Allahu alam, Wallahu a'lam, Allah knows best, Wallahu alam bissawab
اللَّهُ أَعْلَمُ
Allāhu a‘lam
“Allah knows best”
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Allahu a’lam (اللَّهُ أَعْلَمُ) means “Allah knows best”. Muslims say it when they do not know, and scholars end their answers with wallāhu a‘lam to admit that only Allah’s knowledge is complete.
What Allahu A'lam means
A‘lam is the comparative of ‘ālim (knowing): Allah knows more than anyone. The Companions said “Allah and His Messenger know best” when the Prophet ﷺ asked them something they did not know. The longer form, wallāhu a‘lamu biṣ-ṣawāb, means “and Allah knows best what is correct”.
Word by word
| Arabic | Say | Meaning |
|---|---|---|
| اللَّهُ | Allāhu | Allah |
| أَعْلَمُ | a‘lam | knows best / is most knowing |
When to say it
- When you are asked something and do not know.
- At the end of an answer or opinion on a religious question.
- About matters of the unseen.
How to reply
No reply is needed.
Where it comes from
In the Qur’an
قُلِ ٱللَّهُ أَعْلَمُ بِمَا لَبِثُوا۟ ۖ لَهُۥ غَيْبُ ٱلسَّمَٰوَٰتِ وَٱلْأَرْضِ ۖ أَبْصِرْ بِهِۦ وَأَسْمِعْ ۚ مَا لَهُم مِّن دُونِهِۦ مِن وَلِىٍّۢ وَلَا يُشْرِكُ فِى حُكْمِهِۦٓ أَحَدًۭا
Say, "Allah is most knowing of how long they remained. He has [knowledge of] the unseen [aspects] of the heavens and the earth. How Seeing is He and how Hearing! They have not besides Him any protector, and He shares not His legislation with anyone."
سَيَقُولُونَ ثَلَٰثَةٌۭ رَّابِعُهُمْ كَلْبُهُمْ وَيَقُولُونَ خَمْسَةٌۭ سَادِسُهُمْ كَلْبُهُمْ رَجْمًۢا بِٱلْغَيْبِ ۖ وَيَقُولُونَ سَبْعَةٌۭ وَثَامِنُهُمْ كَلْبُهُمْ ۚ قُل رَّبِّىٓ أَعْلَمُ بِعِدَّتِهِم مَّا يَعْلَمُهُمْ إِلَّا قَلِيلٌۭ ۗ فَلَا تُمَارِ فِيهِمْ إِلَّا مِرَآءًۭ ظَٰهِرًۭا وَلَا تَسْتَفْتِ فِيهِم مِّنْهُمْ أَحَدًۭا
They will say there were three, the fourth of them being their dog; and they will say there were five, the sixth of them being their dog - guessing at the unseen; and they will say there were seven, and the eighth of them was their dog. Say, [O Muhammad], "My Lord is most knowing of their number. None knows them except a few. So do not argue about them except with an obvious argument and do not inquire about them among [the speculators] from anyone."
In the hadith
The Prophet ﷺ asked Mu‘adh: “Do you know the right of Allah over His servants?” He said: “Allah and His Messenger know best.”
Sahih al-Bukhari 2856; Sahih Muslim 30
Common mistakes
- Using it to avoid a clear answer. If you know the answer from the Qur’an or sunnah, say it; then add wallahu a’lam in humility.
- Saying “Allah and His Messenger know best” today. Many scholars note this was for the Prophet’s lifetime; now say “Allah knows best”.
Frequently asked questions
What does Allahu a'lam mean?
“Allah knows best.”
What is the difference between Allahu a'lam and wallahu a'lam?
Wallāhu a‘lam adds “and”: “and Allah knows best”. It is used at the end of a statement.
What does wallahu a'lam bis-sawab mean?
“And Allah knows best what is correct.” Scholars write it at the end of answers.
Is it in the Quran?
Yes. Qulillāhu a‘lamu bimā labithū (“say: Allah knows best how long they stayed”, 18:26).
Is it okay to say I don't know?
Yes. The early scholars praised saying “I do not know” and Allahu a’lam rather than guessing in religion.
Related phrases
How this page works and sources
Qur’an text and its English meaning are taken from the same Uthmani text and translation the Niyat app uses, and each ayah links to its place in our Qur’an reader. Hadith are cited by collection and number (Sahih al-Bukhari, Sahih Muslim, Sunan Abi Dawud, Jami at-Tirmidhi, Sunan an-Nasa’i, Sunan Ibn Majah); where a narration has a weak chain we say so. Hadith wording is summarised in plain English. Where the schools of law differ, the page says so in one line. The sound button uses your browser’s own Arabic voice; nothing is sent anywhere.
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