Jami` at-Tirmidhi 3174

Narrated Anas bin Malik:that Ar-Rubai' bint An-Nadr came to the Prophet (ﷺ) - and her son Harithah bin Suraqah had been killed on the Day of Badr, having been struck by an arrow, shot by an unknown person - so she came to the Messenger of Allah (ﷺ) and said: "Inform me about Harithah. If he has reached goodness, I shall be forbearing and patient. If he has not reached goodness, I will struggle supplicating for him." So Allah's Prophet (ﷺ) said: "O Umm Harithah! There are gardens in Paradise, and verily your son Harithah has reached the highest part of Paradise, and Al-Firdaws is the highest part of Paradise, its most center and best