From Sahih Bukhari (Hadith 3898):
Narrated `Umar:I heard the Prophet (ﷺ) saying, "The reward of deeds depends on the intentions, so whoever emigrated for the worldly benefits or to marry a woman, his emigration was for that for which he emigrated, but whoever emigrated for the Sake of Allah and His Apostle, his emigration is for Allah and His Apostle
Reference: Bukhari 3898