فِي أَمَانِ اللَّهِ
Fī amānillāh
In the protection of Allah. (May you be in Allah's protection.)
A common farewell, not from a hadith
Fi amanillah (فِي أَمَانِ اللَّهِ) means "in the protection of Allah". Muslims say it when parting, as a dua that the other person stays safe. The words are not from a hadith, but they are a good dua, and the Sunnah has fuller farewell duas, shown below.
فِي أَمَانِ اللَّهِ
Fī amānillāh
In the protection of Allah. (May you be in Allah's protection.)
A common farewell, not from a hadith
أَسْتَوْدِعُ اللَّهَ دِينَكَ وَأَمَانَتَكَ وَخَوَاتِيمَ عَمَلِكَ
Astawdiʿullāha dīnaka wa amānataka wa khawātīma ʿamalik
I leave your religion, your trust and the end of your deeds in the care of Allah.
Sunan Abi Dawud 2600; Jami at-Tirmidhi 3443, graded sahih
أَسْتَوْدِعُكَ اللَّهَ الَّذِي لَا تَضِيعُ وَدَائِعُهُ
Astawdiʿukallāhal-ladhī lā taḍīʿu wadāʾiʿuh
I leave you in the care of Allah, whose trusts are never lost.
Sunan Ibn Majah 2825, graded sahih
زَوَّدَكَ اللَّهُ التَّقْوَى، وَغَفَرَ ذَنْبَكَ، وَيَسَّرَ لَكَ الْخَيْرَ حَيْثُمَا كُنْتَ
Zawwadakallāhut-taqwā, wa ghafara dhanbak, wa yassara lakal-khayra ḥaythumā kunt
May Allah give you taqwa as your provision, forgive your sins, and make good easy for you wherever you are.
Jami at-Tirmidhi 3444, graded hasan
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Guide
Fi amanillah (فِي أَمَانِ اللَّهِ) means "in the protection of Allah", or more fully, "may you be in Allah's safekeeping". Aman is safety and security. Muslims use it to say goodbye, especially to someone setting out on a journey. A common reply is fi amanillah back, or wa iyyakum, "and you too".
No. The exact words are not reported from the Prophet ﷺ. They are a later, widely used farewell with a sound meaning: asking that Allah keeps the person safe. Saying it is fine. The Sunnah gives fuller farewells, which are better still.
Ibn Umar would say to someone about to travel: "Come close, so I can bid you farewell as the Messenger of Allah ﷺ bid us farewell," and then say Astawdi'ullaha dinaka wa amanataka wa khawatima amalik (Jami at-Tirmidhi 3443). Abu Hurayrah said the Prophet ﷺ bid him farewell with Astawdi'ukallahal-ladhi la tadi'u wada'i'uh (Sunan Ibn Majah 2825). A man about to travel asked the Prophet ﷺ for provision, and he said: "May Allah give you taqwa as your provision." The man asked for more, and he added: "and forgive your sins", then: "and make good easy for you wherever you are" (Jami at-Tirmidhi 3444).
The Prophet ﷺ said: "When one of you arrives at a gathering, let him give salam, and when he wants to leave, let him give salam. The first is no more due than the last" (Sunan Abi Dawud 5208). So the sunnah goodbye is assalamu alaikum, and fi amanillah can come with it.
Fi amanillah stays the same for anyone. The Sunnah duas change their endings: dinaki, amanataki, amaliki to a woman, dinakum, amanatakum, amalikum to a group, and astawdi'ukumullah to a family.
In South Asia people say Allah hafiz ("Allah is the Protector") or Khuda hafiz (Khuda is the Persian word for God). Both carry the same meaning as fi amanillah. None of them is from the hadith, and all are fine alongside the salam.
Fi amanillah, fee amanillah, fi aman Allah and fi amanAllah are the same phrase.
Questions
In the protection of Allah. It is a goodbye that asks Allah to keep the person safe.
Say fi amanillah back, or wa iyyakum (and you too), or ameen.
No. The wording is a later custom with a good meaning. The farewell from the Sunnah is Astawdi'ullaha dinaka wa amanataka wa khawatima amalik (Abu Dawud 2600).
فِي أَمَانِ اللَّهِ
Assalamu alaikum, as when arriving (Abu Dawud 5208), with a dua such as fi amanillah or astawdi'ukallah.