And He said to him, "Most assuredly, I say to you, hereafter you shall see heaven open, and the angels of God ascending and descending upon the Son of Man."
John 1:51
Surrounding context
1:50 Jesus answered and said to him, "Because I said to you, "I saw you under the fig tree,' do you believe? You will see greater things than these."
1:51 And He said to him, "Most assuredly, I say to you, hereafter you shall see heaven open, and the angels of God ascending and descending upon the Son of Man."