I am astonished at the boasting of the Aws while destiny is still circling over them—tomorrow will come, and Time is full of clear lessons.
And at the pride of the Banū Najjār because a group of theirs was struck down at Badr—every one of them, all of them bound to perish.
If some of our men were left lying dead, we are men who will in turn leave others lying dead.
Sleek, bare-throated chargers will drive us into your very midst, O sons of Aws, until the avenger’s soul is satisfied;
and in the heart of Banū Najjār we shall renew the onslaught, spears thrusting, mailed warriors pressing hard.
We shall leave slain men about whom the carrion birds wheel, and they will have no helper but empty wishes.
Women of Yathrib will weep over them, spending sleepless nights in lament,
for our swords will never cease to run with the flowing blood of those who fight against them.
If you prevailed on the day of Badr, it was only through Aḥmad; by him your fortune rose, and he stands openly triumphant,
backed by a band of righteous men—his loyal guardians—who shield him in hardship while death is present.
Abū Bakr and Ḥamzah are counted among them, and ʿAlī is named whenever they are mentioned.
Those heroes are not the offspring bred in the dwellings of Aws or Najjār when they boast;
rather, their ancestry goes back to Luʾayy ibn Ghālib—when pedigrees are reckoned, it is Kaʿb and ʿĀmir.
They are the ones who lance the horses in every battle; on the day of turmoil they are the noblest and the most numerous.

Kaʿb ibn Mālik answered him with the ode we have already cited, beginning:

‘I marvel at God’s decree—God is All-Powerful;
whatever He wills comes to pass, and none can overpower Him.’

Ibn Isḥāq adds: Abū Bakr—whose personal name was Shaddād ibn al-Aswad ibn Shaʿūb—also recited.
I would note that al-Bukhārī relates that he married the former wife of Abū Bakr al-Ṣiddīq after the latter divorced her, once God forbade Muslim men to remain with polytheist women. Her name was Umm Bakr, and he said:

Umm Bakr greets me with wishes of peace—
but what peace is left to me now that my people are gone?
What is there at the well, the well of Badr,
of singing girls and noble companions in drink?
What is there at the well, the well of Badr,
of shizā-wood shafts crowned with gleaming points?