عَنْ أَنَسِ بْنِ مَالِكٍ، قَالَ قَالَ رَسُولُ اللّٰهِ صلّى اللّٰهُ عليه وسلّم: مَنْ خَرَجَ فِي طَلَبِ الْعِلْمِ فَهُوَ فِي سَبِيلِ اللّٰهِ حَتَّى يَرْجِعَ.
It was narrated by Hazrat Anas bin Malikra that “Allah’s Messengersa declared, ‘Whoever sets out in pursuit of knowledge is in the path of Allah until he returns.’”
(Sunan at-Tirmidhi, Kitab al-‘ilmi ‘an rasulillahsa, Hadith 2647)