أَلَمَّا تَعْلَمُوا مِنَّا وَمِنْكُمْ كَتَائِبَ يَطَّعِنَّ وَيَرْتَمِينَا
Have you not known the battle units of both our sides, thrusting with spears and hurling weapons against each other?
Katāʾib is the plural of katībah, an organized fighting unit. Yaṭṭaʿinna evokes repeated spear-thrusting, while yartamīnā evokes reciprocal attacks.
Minnā wa-minkum explicitly includes fighters from both tribes. The poet appeals to a shared memory of battle, using the question as an accusation rather than a request for news.