كتاب المقدمات
The Book of Miscellany
(1)
Chapter: Sincerity and Significance of Intentions and all Actions, Apparent and Hidden
(1)
- باب الإخلاص وإحضارالنية
Riyad as-Salihin 3
A'ishah (May Allah be pleased with her) narrated that the Prophet (ﷺ) said, "There is no emigration after the conquest (of Makkah) but only Jihad [(striving and fighting in the cause of Allah) will continue] and good intention.* So if you are summoned to fight, go forth."

[Al-Bukhari and Muslim].

.
وعن عائشة رضي الله عنها قالت قال النبي صلى الله عليه وسلم‏:‏ ‏ "‏ لا هجرة بعد الفتح، ولكن جهاد ونية، وإذا استنفرتم فانفروا‏"‏ ‏(‏‏(‏متفق عليه‏)‏‏)‏‏.‏
Reference : Riyad as-Salihin 3
In-book reference : Introduction, Hadith 3