Answer:
During his farewell speech, Samuel asked for a sign from God to confirm his faithfulness and integrity as a judge over Israel. He asked the people to bear witness against him if he had wronged anyone or taken anything from them. Samuel then asked God to send thunder and rain on that day, which was typically a dry season.
Samuel's request for thunder and rain was not only a sign of God's power, but also a symbolic gesture to demonstrate his innocence and God's approval of his leadership. The people witnessed the extraordinary occurrence of thunder and rain during the dry season, which validated Samuel's integrity as a judge and prophet.
By asking for this sign, Samuel aimed to reassure the people that he had faithfully served them and had not abused his power. The thunder and rain served as a visible confirmation of Samuel's honesty and the righteousness of his leadership.