(6) باب الْخَطَإِ وَالنِّسْيَانِ فِي الْعَتَاقَةِ وَالطَّلاَقِ وَنَحْوِهِ، وَلاَ عَتَاقَةَ إِلاَّ لِوَجْهِ اللَّهِ
Narrated `Umar bin Al-Khattab:
The Prophet (ﷺ) said, "The (reward of) deeds depend on intentions, and every person will get the reward according to what he intends. So, whoever migrated for Allah and His Apostle, then his migration will be for Allah and His Apostle, and whoever migrated for worldly benefits or for marrying a woman, then his migration will be for what he migrated for." (See Hadith No. 1, Vol. 1)
Reference: Sahih al-Bukhari 2529
In-book reference: Book 49, Hadith 14
USC-MSA web (English) reference(deprecated numbering scheme): Vol. 3, Book 46, Hadith 706