Sunan an Nasai
3138
Hasan+2

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

HasanAbu Ghuddah
HasanAl-Albani