In the grave - It was sometimes the custom to embalm the dead, but in this case it does not seem to have been done. He was probably buried soon after death.

He had lain in the grave four days already - Our Lord probably left Bethabara the day, or the day after, Lazarus died. He came to Bethany three days after; and it appears that Lazarus had been buried about four days, and consequently that he had been put in the grave the day or day after he died. Though it was the Jewish custom to embalm their dead, yet we find, from John 11:39, that he had not been embalmed; and God wisely ordered this, that the miracle might appear the more striking.

Then when Jesus came,.... The Alexandrian copy, and all the Oriental versions add, "to Bethany"; though it seems by what follows, that he was not come to the town itself, but near it; and it looks as if it was not far from Lazarus's grave; and it was usual to bury without the city; and here he had intelligence of his, Lazarus's, death, and how long he had been dead:

for he found he had lain in the grave four days already; it is very likely that he died the same day that Mary and Martha sent to Christ to acquaint him with his sickness, and the same day he was buried; for the Jews used to bury the same day a person died, and so they do now: and after Christ had this account, he stayed two days where he was, and on the third day, he proposed to his disciples to go into Judea; and very probably on that, or on the next day, which was the fourth, they set out and came to Bethany; See Gill on John 11:39.

Had lain in the grave four days already (τέσσαρας ἡμέρας ἤδη ἔχοντα ἐν τῷ μνημείῳ)

Literally, found him having already four days in the tomb.

Then when Jesus came, he found that he had lain in the grave four days already.

17-19. when Jesus came, he found that he had lain in the grave four days-If he died on the day the tidings came of his illness-and was, according to the Jewish custom, buried the same day (see Jahn's Archæology, and Joh 11:39; Ac 5:5, 6, 10)-and if Jesus, after two days' further stay in Perea, set out on the day following for Bethany, some ten hours' journey, that would make out the four days; the first and last being incomplete [Meyer].

11:17-32 Here was a house where the fear of God was, and on which his blessing rested; yet it was made a house of mourning. Grace will keep sorrow from the heart, but not from the house. When God, by his grace and providence, is coming towards us in ways of mercy and comfort, we should, like Martha, go forth by faith, hope, and prayer, to meet him. When Martha went to meet Jesus, Mary sat still in the house; this temper formerly had been an advantage to her, when it put her at Christ's feet to hear his word; but in the day of affliction, the same temper disposed her to melancholy. It is our wisdom to watch against the temptations, and to make use of the advantages of our natural tempers. When we know not what in particular to ask or expect, let us refer ourselves to God; let him do as seemeth him good. To enlarge Martha's expectations, our Lord declared himself to be the Resurrection and the Life. In every sense he is the Resurrection; the source, the substance, the first-fruits, the cause of it. The redeemed soul lives after death in happiness; and after the resurrection, both body and soul are kept from all evil for ever. When we have read or heard the word of Christ, about the great things of the other world, we should put it to ourselves, Do we believe this truth? The crosses and comforts of this present time would not make such a deep impression upon us as they do, if we believed the things of eternity as we ought. When Christ our Master comes, he calls for us. He comes in his word and ordinances, and calls us to them, calls us by them, calls us to himself. Those who, in a day of peace, set themselves at Christ's feet to be taught by him, may with comfort, in a day of trouble, cast themselves at his feet, to find favour with him.