Yahya bin Abd al-Rahman bin Abi Labibah narrates from his father, from his grandfather Abu Labibah (may Allah be pleased with him), that the Messenger of Allah (peace and blessings be upon him) said: "Whoever considers it permissible to give one dirham as dower, it is permissible for him to marry."
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الصداق / 14372