Mark 4:31 (BSB)

It is like a mustard seed, which is the smallest of all seeds sown upon the earth.

From Mark 4. Also in the ESV.

Commentary on Mark 4:31

• Matthew Henry (Presbyterian), Matthew Henry's Complete Commentary on Mark 4:21-34: The lessons which our Saviour designs to teach us here by parables and figurative expressions are these: - I. That those who are good ought to consider the obligations they are under to do good; that is, as in the parable before, to bring forth fruit.
• John Gill (Reformed Baptist), Exposition of the Old and New Testaments on Mark 4:31: And when they had sent away the multitude,.... Who had been attending him all day on the sea shore; though they seem to have been dismissed by Christ, when he went into the house, and privately interpreted the parables to his disciples: see Mat 13:36, wherefore it is possible, that upon Christ's going to the sea shore again, in order to take boat for the...
• Adam Clarke (Methodist), Clarke's Commentary on the Bible on Mark 4:31: A grain of mustard seed - See on Mat 13:31, Mat 13:32 (note).