''Arise, go to Zarephath, which belongs to Sidon and dwell there, Behold, I have commanded a widow there to feed you''. What exactly necessitated this event...

The event you're referring to is a story in the Bible, where the prophet Elijah was commanded by God to go to the town of Zarephath and be fed by a widow. This event happened because of the drought caused by Elijah's curse. Elijah had previously prayed for a drought to fall upon the land as a result of King Ahab's evil in the sight of the Lord and the people's worship of false gods. The drought caused a severe famine and many people, including Elijah, were struggling to find food. So, God commanded Elijah to go to Zarephath, where a widow would provide for him. This was a test of faith for both Elijah and the widow, as there was very little food available, but they both trusted in God's provision and were blessed as a result.