1 Samuel 12:18
So Samuel called unto the LORD; and the LORD sent thunder and rain that day — Samuel's prayer is answered immediately. Thunder (kol YHWH, the voice of the LORD) and rain fall on the harvest day, confirming Samuel's prophetic power and divine validation of his message. and all the people greatly feared the LORD and Samuel — the people's fear ('yaron, were afraid') is directed both at God and at Samuel, the prophet whose word has proven true.