ENOfficial
It was narrated from Yahya bin Al-Walid bin 'Ubadah bin As-Samit that his grandfather said: "The Messenger of Allah (ﷺ) said: 'Whoever fights in the cause of Allah intending only to get an 'Iqal, he will have what he intended."
Source: sunnah.com
Other translations
Arabic
أَخْبَرَنَا عَمْرُو بْنُ عَلِيٍّ، قَالَ حَدَّثَنَا عَبْدُ الرَّحْمَنِ، قَالَ حَدَّثَنَا حَمَّادُ بْنُ سَلَمَةَ، عَنْ جَبَلَةَ بْنِ عَطِيَّةَ، عَنْ يَحْيَى بْنِ الْوَلِيدِ بْنِ عُبَادَةَ بْنِ الصَّامِتِ، عَنْ جَدِّهِ، قَالَ قَالَ رَسُولُ اللَّهِ صلى الله عليه وسلم " مَنْ غَزَا فِي سَبِيلِ اللَّهِ وَلَمْ يَنْوِ إِلاَّ عِقَالاً فَلَهُ مَا نَوَى " .
sunnah.com