Luke 9.58 (cf. Matthew 8.20):
And Jesus said unto him, Foxes have holes, and birds of the air have nests; but the Son of man hath not where to lay his head.
Joseph A. Fitzmyer in his commentary on Luke notes the parallel with a passage in Plutarch's Life of Tiberius Gracchus
(9.4-5), but does not quote it. Here it is in Bernadotte Perrin's translation:
Tiberius, striving to support a measure which was honourable and just with an eloquence that would have adorned even a meaner cause, was formidable and invincible, whenever, with the people crowding around the rostra, he took his stand there and pleaded for the poor. "The wild beasts that roam over Italy," he would say, "have every one of them a cave or lair to lurk in; but the men who fight and die for Italy enjoy the common air and light, indeed, but nothing else; houseless and homeless they wander about with their wives and children. And it is with lying lips that their imperators exhort the soldiers in their battles to defend sepulchres and shrines from the enemy; for not a man of them has an hereditary altar, not one of all these many Romans an ancestral tomb, but they fight and die to support others in wealth and luxury, and though they are styled masters of the world, they have not a single clod of earth that is their own."