The Messenger of Allah ﷺ said, "The most excellent jihad in the sight of Allah on the Day of Resurrection is that of those who meet the enemy in the battle line and do not turn their faces away until they are killed. They will recline in the highest chambers of Paradise, and your Lord will look upon them. When your Lord smiles upon a people, there is no reckoning against them."
قال رسول الله ﷺ: أفضل الجهاد عند الله يوم القيامة الذين يلتقون في الصف فلا يلفتون وجوههم حتى يقتلوا، أولئك يتلبطون في الغرف العلى من الجنة، ينظر إليهم ربك، إن ربك إذا ضحك إلى قوم فلا حساب عليهم.
Tabarani related it in al-Awsat (2684 - Majmaa Bahrayn) from Ali bin Saeed, who said, Saeed bin Yahya bin Saeed Umawi told us, my uncle Anbasah bin Saeed told us, Abdullah bin Mubarak told us, from Uzai, from Urwa bin Ruwaym, from Qazaa bin Yahya, from Abu Saeed Khudri, and he related it.Its chain of transmission is hasan because of Ali bin Saeed, who is Razi, and Urwa bin Ruwaym, for these two make the hadith hasan. Munziri said in al-Targhib (2152), "Tabarani related it with a hasan chain of transmission."