Benefit: So, You're Impressed by the Lunacy of Jihadist Beheadings?
In the Name of Allāh, the Ever Merciful, the Bestower of Mercy
Narrated by Ibn 'Umar (رضي الله عنه): "The Prophet (ﷺ) said, 'A woman entered the Fire because of a cat which she had tied, neither giving it food nor setting it free to eat from the vermin of the earth.'" (Reported Ṣaḥiḥ Bukhārī, Vol. 4, Book 54, No. 535.)
Narrated by Abū Hurayrah (رضي الله عنه): "The Messenger (ﷺ) said, 'A prostitute was forgiven by Allāh, because while passing by a panting dog near a well she saw that the dog was about to die of thirst, so she took off her shoe, and tying it with her head-cover, she drew out some water for it. So, Allāh forgave her because of that.'" (Reported in Ṣaḥiḥ Bukhārī, Vol. 4, Book 54, No. 538.)
Narrated by 'Abdullāh ibn 'Amr (رضي الله عنه): "The Prophet (ﷺ) said, 'Whoever killed a Mu'ahid [a person who is granted the pledge of protection by the Muslims] shall not smell the fragrance of paradise though its fragrance can be smelt at a distance of forty years [of traveling].'" (Reported in Ṣaḥiḥ Bukhārī, Vol. 9, Book 83, No. 49.)
Indeed, we do not rejoice in the unjust killings of Muslims or non-Muslims, this is not victory. Victory lies in applying the Qur'an and Sunnah upon the understanding of the Salaf us-Sālih.