Midrash su Salmi 30:3

What did Solomon do? Our sages of blessed memory said: He raised the coffin of his father, David, and prostrated himself before it, praying: O Lord God, turn not away the face of Thine anointed. R. Berechiah declared in the name of R. Helbo: At that time David came to life, as you may understand for yourself from David’s own words: O Lord, Thou broughtest up my soul from the netherworld; Thou didst keep me alive, that I should not go down to the pit (Ps. 30:4). Solomon said: Master of the Universe, make it go in for his sake: Remember the good deeds of David Thy servant (II Chron. 6:42). And his prayers were answered immediately, as it is said: O Lord God, turn not away the face of Thine anointed. What is written after that? Now when Solomon had made an end of praying, the fire came down from heaven, etc. (ibid. 7:1). The Holy Spirit then cried out, saying: Wherefore I praise the dead that are already dead (Eccles. 4:2). Thereupon Solomon began to pray: Lift up your heads, O ye gates, and be ye lifted up, ye everlasting doors; that the King of glory may come in (Ps. 24:7). The gates wanted to crush his head, for they thought that he had called himself the King of glory. They said to him: Who is this King of glory? (ibid., v. 10), and he replied: The Lord of hosts, He is the King of glory. When he responded in this way, they were appeased. If they had not been, they would have fallen on his head and crushed him.