a door, passage, entrance, threshold...

"Ask and it will be given to you;
seek and you will find; knock
and the door will be opened to you.

For everyone who asks receives;
he who seeks finds; and to him who knocks,
the door will be opened. Matthew 7:7,8

"Better is one day in your courts
than a thousand elsewhere;
I would rather be a doorkeeper in the house of my God
than dwell in the tents of the wicked.

For the LORD God is a sun and shield;
the LORD bestows favor and honor;
no good thing does he withhold
from those whose walk is blameless."

Psalm 84:10,11