Here are some Scriptures that tell us about what happens when we do not come to the LORD in prayer!
Then the men of Israel took some of their provisions; but they did not ask counsel of the LORD. (Jos 9:14 NKJV)
Moreover, as for me, far be it from me that I should sin against the LORD in ceasing to pray for you; but I will teach you the good and the right way. (1Sa 12:23 NKJV)
Then he said to him, “Thus says the LORD: ‘Because you have sent messengers to inquire of Baal-Zebub, the god of Ekron, is it because there is no God in Israel to inquire of His word? Therefore you shall not come down from the bed to which you have gone up, but you shall surely die.’ ” (2Ki 1:16 NKJV)
So Saul died for his unfaithfulness which he had committed against the LORD, because he did not keep the word of the LORD, and also because he consulted a medium for guidance. But he did not inquire of the LORD; therefore He killed him, and turned the kingdom over to David the son of Jesse. (1Chr 10:13-14 NKJV)
For because you did not do it the first time, the LORD our God broke out against us, because we did not consult Him about the proper order. (1Chr 15:13 NKJV)
So He said to them, “This kind can come out by nothing but prayer and fasting.” (Mark 9:29 NKJV)