Allah's Messenger (ﷺ) delivered a sermon and said, "Zaid received the flag and was martyred, then Ja`far took it and was martyred, then `Abdullah bin Rawaha took it and was martyred, and then Khalid bin Al-Walid took it without being appointed, and Allah gave him victory." The Prophet (ﷺ) added, "I am not pleased (or they will not be pleased) that they should remain (alive) with us," while his eyes were shedding tears.
Sahih al-Bukhari Book 56, Hadith 268
← Previous Hadith as follows in Hadith 297. Narrated Abu Huraira:

We were in the company of Allah's Messenger (ﷺ) in a Ghazwa, and he remarked about a man who claimed to be a Muslim, saying, "This (man) is from the people of the (Hell) Fire." When the battle started, the man fought violently till he got wounded. Somebody said, "O Allah's Messenger (ﷺ)! The man whom you described as being from the people of the (Hell) Fire fought violently today and died." The Prophet (ﷺ) said, "He will go to the (Hell) Fire." Some people were on the point of doubting (the truth of what the Prophet had said) while they were in this state, suddenly someone said that he was still alive but severely wounded. When night fell, he lost patience and committed suicide. The Prophet (ﷺ) was informed of that, and he said, "Allah is Greater! I testify that I am Allah's Slave and His Apostle." Then he ordered Bilal to announce amongst the people: 'None will enter Paradise but a Muslim, and Allah may support this religion (i.e. Islam) even with a disobedient man.'

Sahih al-Bukhari Book 56, Hadith 267 Next Hadith → The people of the tribes of Ril, Dhakwan, 'Usiya and Bani Lihyan came to the Prophet (ﷺ) and claimed that they had embraced Islam, and they requested him to support them with some men to fight their own people. The Prophet (ﷺ) supported them with seventy men from the Ansar whom we used to call Al-Qurra'(i.e. Scholars) who (out of piety) used to cut wood during the day and pray all the night. So, those people took the (seventy) men till they reached a place called Bi'r-Ma'ana where they betrayed and martyred them. So, the Prophet (ﷺ) invoked evil on the tribe of Ril, Dhakwan and Bani Lihyan for one month in the prayer.

Narrated Qatada: Anas told us that they (i.e. Muslims) used to recite a Quranic Verse concerning those martyrs which was:-- "O Allah! Let our people be informed on our behalf that we have met our Lord Who has got pleased with us and made us pleased." Then the Verse was cancelled.

Sahih al-Bukhari Book 56, Hadith 269