Ibrahim Nakha'i (may Allah have mercy on him) said: "If a man marries a woman on the condition that he will take her for Hajj, then the marriage is valid. If he divorces her before consummation, he must give half the expenses that would be incurred for a similar Hajj."
Hadith Referenceسنن سعید بن منصور / كتاب النكاح / 1852
Hadith Takhrij«أخرجه سعيد بن منصور فى «سننه» ترقيم الدرالسلفية برقم:، 675، وابن أبى شيبة فى «مصنفه» برقم: 16833»