Umm Salama bint Abu Umaya reported,

I have not forgotten his words on the day of the Trench, as he was handing them the bricks and the hair on his chest had become covered in dust. He was saying, "O Allah, the true good is the good of the Hereafter, so forgive the Ansar and the Muhajirun."Then he saw Ammar and said, "Alas for him, the son of Sumayy. The transgressing party will kill him."The narrator said, I mentioned this to Muhammad, meaning Ibn Sirin, and he asked, "From his mother?"I said, "Yes. She used to mix with her and visit her regularly."

Ahmad 26482

Sahih

حدثنا ابن أبي عدي عن ابن عون عن الحسن عن أمه

عن أم سلمة قالت

ما نسيت قوله يوم الخندق وهو يعاطيهم اللبن وقد اغبر شعر صدره وهو يقول اللهم إن الخير خير الآخره فاغفر للأنصار والمهاجره قال فرأى عمارا فقال ويحه ابن سمية تقتله الفئة الباغية قال فذكرته لمحمد يعني ابن سيرين فقال عن أمه قلت نعم أما إنها كانت تخالطها تلج عليها

أحمد 26482صحيح
Contents
Reference
Commentary
Ayat
Collection
Musnad Ahmad
Book
Umm Salama
Numbering
Darussalam 26482
Ahmad 26482