On what occasion did Christ say, “The foxes have holes, and the birds of the air have nests; but the Son of man hath not where to lay his head”?

On what occasion did Christ say, “The foxes have holes, and the birds of the air have nests; but the Son of man hath not where to lay his head”?
Answer:-When a scribe said that he would follow Christ wherever he went; Matt. 8:19, 20.