No Mourning Allowed

The people of Quraysh, so as not to have the Muslims rejoice at their misfortune, prevented anyone from crying publicly for the dead — there was no wailing allowed. They also refused to allow anybody to investigate the issue of ransoming the prisoners, so that Muḥammad (peace be upon him) wouldn't raise the price of ransom. Ibn Kathīr^** says about this: he observed that Allah's forcing them to forgo mourning for their dead was part of the totality of His punishment of those of them that remained alive at that time, for weeping for the dead contributes to the recovery of the grieving heart — so this prevention of mourning was in fact more of a torment for the people of Quraysh, the ones who were living.

Al-Aswad ibn al-Muṭṭalib was afflicted with the loss of three of his sons — Zamʿah, ʿAqīl, and al-Ḥārith ibn Zamʿah. This was an old man; he was already blind, and he lost three of his sons, and he wasn't allowed to mourn their deaths. So one night he hears a woman weeping. So he said: go and see if mourning has become permissible — is Quraysh now bewailing their dead? Perhaps I will now be able to lament the loss of Abū Ḥakīmah, my eldest son, for I am in great pain. So they went to find out why the woman was crying, and they found out she's crying because she lost a camel. So he says these lines of poetry:

Is she weeping because a camel of hers has gone astray, and so insomnia keeps her from sleeping? Do not weep over a young camel, but over Badr, that ruined all hopes — over Badr and the elite of Banū Ḥusays and Makhzūm and the tribe of Abū al-Walīd, and weep, if you weep at all, for Abū ʿAqīl and for al-Ḥārith, the line of lions — weep for them all and don't hold back, for there is none the like of Abū Ḥakīmah. After them it is other men who rule, and had it not been for Badr, they would not have come to lead.

So this poor old man wasn't even allowed to mourn the loss of his three sons. Why? So that the news wouldn't reach Muḥammad (peace be upon him), that the disbelievers of Quraysh are suffering because of their death. They wanted to show they don't care about it, and they wanted to show that they don't care about the ransom of the captives.