Abd al-Rahman bin Hurmuz al-A'raj (may Allah have mercy on him) narrates from Sayyiduna Mu'awiyah bin Abi Sufyan (may Allah be pleased with him) that the Prophet (peace and blessings be upon him) forbade shighar (exchange marriage without dowry).
Hadith Referenceالمعجم الكبير للطبراني / باب الميم / 16852