1Kgs 17:22

“As we mentioned, that widow prefigured the church, and her son was a type of the Gentiles. The son of the widow lay dead because the son of the church, that is, the Gentiles, was dead because of many sins and offenses. At the prayer of Elijah, the widow's son was revived; at the coming of Christ, the church's son or the Christian people were brought back from the prison of death. Elijah bent down in prayer, and the widow's son was revived; Christ sank down in his passion, and the Christian people were brought back to life. Why blessed Elijah bent down three times to arouse the boy I believe that the understanding of your charity has grasped even before I say it. In the fact that he bowed three times is shown the mystery of the Trinity. Not only the Father without the Son, nor the Father and Son without the Holy Spirit, but the whole Trinity restored the widow's son or the Gentiles to life. Moreover, this is further demonstrated in the sacrament of baptism, for the old person is plunged in the water three times, in order that the new person may merit to rise. - "Sermon 124.4"”