'Fig tree' in the Bible

Nathaniel said to him: How knowest thou me? Jesus answered and said to him: Before Philip called you, while you were under the fig-tree, I saw you.

Jesus answered and said to him: Do you believe, be cause I said to you, I saw you under the fig-tree? You shall see greater things than these. And he said to him: Verily, verily I say to you, From this time you shall see heaven opened, and the angels of God ascending and descending upon the Son of man.