Mark 4:32
But when it is sown, it groweth up, and becometh greater than all herbs, and shooteth out great branches; so that the fowls of the air may lodge under the shadow of it.
Cross-reference
Mark 4:28 describes gradual growth of seed into grain, mirroring the mustard seed's growth from tiny to large — both illustrate kingdom's organic development.
Daniel 4:20-22 uses a great tree sheltering birds to represent Nebuchadnezzar's kingdom, directly paralleling the mustard tree image of God's kingdom.
Luke 13:19 is the parallel account of the same mustard seed parable with identical imagery of birds perching in branches.
Ezekiel 31:3-10 describes a cedar with birds nesting, mirroring the mustard plant's branches — but the cedar represents pride, not the kingdom.
Daniel 4:10-12 features a tree providing shelter for all creatures, like the mustard plant — but the tree represents a worldly kingdom that falls.
Psalm 80:9-11 describes Israel as a vine spreading branches, echoing the mustard plant's growth and shelter.