It is reported from Sayyiduna Anas bin Malik (may Allah be pleased with him) about the reciters and their tragic martyrdom; the narrator said: Sayyiduna Anas (may Allah be pleased with him) said to me: I saw the Messenger of Allah (peace and blessings be upon him), whenever he offered the morning prayer, raising his hands and supplicating against them (the disbelieving tribes), meaning those who had martyred the reciter Companions (may Allah be pleased with them).
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الصلاة / 3145