ENOfficial
Anas reported God’s messenger as saying, “He who goes out in search of knowledge is in God’s path till he returns.” Tirmidhi and Darimi transmitted it.
Source: sunnah.com
Other translations
Arabic
وَعَنْ أَنَسٍ قَالَ: قَالَ رَسُولُ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ: «مَنْ خَرَجَ فِي طَلَبِ الْعِلْمِ فَهُوَ فِي سَبِيلِ اللَّهِ حَتَّى يرجع» . رَوَاهُ التِّرْمِذِيّ والدارمي
sunnah.com