2nd Chronicles 7:14

"If my people, which are called by my name, shall humble themselves, and pray, and seek my face, and turn from their wicked ways; then will I hear from heaven, and will forgive their sin, and will heal their land."

Matthew 17:21

"And [Jesus] said unto them, This kind [of evil] can come forth by nothing, but by prayer and fasting."

Matthew 22:22

"And all things, whatsoever ye shall ask in prayer, believing, ye shall receive."