Suwayd bin Ghafalah said: Sayyiduna Umar (may Allah be pleased with him) said to me: "O Abu Umayyah, perform Hajj and make a stipulation, for you will have what you stipulated, and you owe Allah what you stipulated."
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الحج / 10118