Vowing to build a Masjid if Allah grants him a job and buys a piece of land

Q: Ten years ago, I took upon myself that if Allah helps me travel to Saudi Arabia and buy a piece of land I would build a Masjid (mosque) in it for the sake of Allah. Praise be to Allah Who helped me travel and buy a piece of land which is 75 meters (7.10 meters in width and 10.5 meters in length). Allah willed that the right side of this land becomes a Masjid. Please, tell me how can I fulfill that vow, which I took upon myself to fulfill?

A: You must fulfill your vow, because the Prophet (peace be upon him) said, Whoever vows to do an act of obedience to Allah should do so, and whoever makes a vow to disobey Allah should not disobey Him. (Part No. 23; Page No. 288) May Allah grant us success. May peace and blessings be upon our Prophet Muhammad, his family, and Companions.