Jesus said unto him - Bishop Pearce observes: "Probably Luke wrote αυτους, not αυτον, said unto them, i.e. to those who had before called Zaccheus a sinner; (Luke 19:7); for Jesus here speaks of Zaccheus in the third person, he also is a son of Abraham, and therefore he was not then speaking to him." This conjecture of this respectable prelate is supported by the margin of the later Syriac, and by every copy of the Itala but two.

To this house - Τῳ οικῳ τουτῳ, To this very house or family. As if he had said: "If he be a sinner, he stands in the greater need of salvation, and the Son of man is come to seek and save what was lost, Luke 19:10; and therefore to save this lost soul is a part of my errand into the world." See the sentiment contained in this verse explained on Matthew 18:11 (note).

Luke 5:31,32 And Jesus answering said to them, They that are whole need not a physician; but they that are sick...

Luke 15:4-7,32 What man of you, having an hundred sheep, if he lose one of them, does not leave the ninety and nine in the wilderness...

Ezekiel 34:16 I will seek that which was lost, and bring again that which was driven away, and will bind up that which was broken...

Matthew 1:21 And she shall bring forth a son, and you shall call his name JESUS: for he shall save his people from their sins.

Matthew 9:12,13 But when Jesus heard that, he said to them, They that be whole need not a physician, but they that are sick...

Matthew 10:6 But go rather to the lost sheep of the house of Israel.

Matthew 15:24 But he answered and said, I am not sent but to the lost sheep of the house of Israel.

Matthew 18:11 For the Son of man is come to save that which was lost.

Romans 5:6 For when we were yet without strength, in due time Christ died for the ungodly.

1 Timothy 1:13-16 Who was before a blasphemer, and a persecutor, and injurious: but I obtained mercy, because I did it ignorantly in unbelief...

Hebrews 7:25 Why he is able also to save them to the uttermost that come to God by him, seeing he ever lives to make intercession for them.

1 John 4:9-14 In this was manifested the love of God toward us, because that God sent his only begotten Son into the world...

Melted by Kindness
'And when Jesus came to the place, He looked up, and saw him, and said unto him, Zacchaeus, make haste, and come down; for to-day I must abide at thy house.' --LUKE xix. 5. It is characteristic of Luke that only he tells the story of Zacchaeus. He always dwells with special interest on incidents bringing out the character of Christ as the Friend of outcasts. His is eminently the Gospel of forgiveness. For example, we owe to Him the three supreme parables of the lost sheep, the lost coin, and the …
Alexander Maclaren—Expositions Of Holy Scripture

A Day to be Remembered
"And Jesus said unto him, This day is salvation come to this house."--Luke 19:9. OBSERVE, DEAR FRIENDS, that our Lord spoke this sentence to Zacchaeus. Some of us may have fancied that he said it to the objecting people, but he did not. They may have heard it, and their objection may have been answered by it, but the main purpose of our blessed Lord, in uttering those words, was not to answer objectors, but to comfort one who might feel dispirited by their murmuring remark. Therefore, "Jesus said …
Charles Haddon Spurgeon—Spurgeon's Sermons Volume 46: 1900

The Honoured Guest
ARE you prepared, like Zaccheus, to give the Lord Jesus Christ a glad and grateful welcome? If we would obtain the full benefit of his devoted life, his atoning death, and his triumphant resurrection, we must receive him into our hearts by simple faith, and entertain him with tender love. Outside the door of our heart Jesus is a stranger; he is no Saviour to us; but inside the heart which has been opened, by divine grace, to admit him, his power is displayed, his worth is known, and his goodness …
Charles Haddon Spurgeon—Spurgeon's Sermons Volume 61: 1915