John 14:12-14 (KJV 1900)
12 Verily, verily, I say unto you, He that believeth on me, the works that I do shall he do also; and greater works than these shall he do; because I go unto my Father. 13 And whatsoever ye shall ask in my name, that will I do, that the Father may be glorified in the Son. 14 If ye shall ask any thing in my name, I will do it.
Matthew 21:21-22 (KJV 1900)
21 Jesus answered and said unto them, Verily I say unto you, If ye have faith, and doubt not, ye shall not only do this which is done to the fig tree, but also if ye shall say unto this mountain, Be thou removed, and be thou cast into the sea; it shall be done. 22 And all things, whatsoever ye shall ask in prayer, believing, ye shall receive.
Ephesians 2:18 (KJV 1900)
18 For through him we both have access by one Spirit unto the Father.