Jihad: The forgotten obligation
19: Goodness in the Horse's Forelocks
Narrated Abdullah bin Umar (ra) that the Prophet (saw) said, "Good will remain (as a permanent quality) in the forelocks of horses (for Jihaad) till the day of judgement". (Sahih Bukhari, p399. vol.1)
The explanation of goodness has been stated in another hadith of Bukhari as reward and booty. (Sahih Bukhari, p.400, vol.1)
This hadith is from those ahadith in which it has been proven that Jihaad will continue till the day of Judgement.