1 Samuel 12

Samuel counseled Israel (and us), knowing that at times we may be led by wicked leaders -

"If ye will fear the LORD, and serve him, and obey his voice, and not rebel against the commandment of the LORD, then shall both ye and also the king that reigneth over you continue following the LORD your God:
15 But if ye will not obey the voice of the LORD, but rebel against the commandment of the LORD, then shall the hand of the LORD be against you..."  (Old Testament | 1 Samuel 12:14 - 15)

And -

"...yet turn not aside from following the LORD, but serve the LORD with all your heart;
21 And turn ye not aside: for then should ye go after vain things, which cannot profit nor deliver; for they are vain.
22 For the LORD will not forsake his people for his great name's sake: because it hath pleased the LORD to make you his people.
23 Moreover as for me, God forbid that I should sin against the LORD in ceasing to pray for you: but I will teach you the good and the right way:
24 Only fear the LORD, and serve him in truth with all your heart: for consider how great things he hath done for you." (Old Testament | 1 Samuel 12:20 - 24)

And then warns -

"But if ye shall still do wickedly, ye shall be consumed, both ye and your king."  (Old Testament | 1 Samuel 12:25)

I notice in most of the teachings and instructions that we get from our leaders is an if...then what.  This was the case with Samuel.