Sayyiduna Furat bin Hayyan al-Ijli (may Allah be pleased with him) asked the Messenger of Allah (peace and blessings be upon him) about the alliances of the Days of Ignorance, and the Messenger of Allah (peace and blessings be upon him) said: "Perhaps you are asking about the alliance of Lakhm and Tamim?" He said: Yes, O Messenger of Allah. He (peace and blessings be upon him) said: "Islam only makes it stronger."
Hadith Referenceالمعجم الكبير للطبراني / باب الفاء / 15923