Qurra al-Muzani said that the Prophet asked a man who used to come to him along with a son of his whether he loved his son, and the man replied, “Messenger of God, may God love you as I love him." The Prophet missed him, and on enquiring what had happened to so and so’s son he was told that he had died. Thereupon he said, “Would you not like to find him waiting for you no matter to which gate of paradise you came?” A man asked whether that applied particularly to him, or to all of them, and he told him that it applied to them all.
‘Abdallah b. Mas'ud reported God’s messenger as saying, “If anyone is predeceased by three of his children who did not grow old enough to sin, they will be a strong protection for him from hell.” When Abu Dharr said he had been predeceased by two, he told him that the same applied. Ubayy b. Ka'b Abu Mundhir, the chief of the Qur'an readers, said he had been predeceased by one, and he told him the same applied.
Tirmidhi and Ibn Majah transmitted it, Tirmidhi saying that this is a gharib tradition.
‘Ali reported God’s messenger as saying, “The abortion will dispute with his Lord when He causes his parents to enter hell, and will receive the reply, ‘You abortion who are disputing with your Lord, bring your parents into paradise.’ He will then draw them with his umbilical cord till he brings them into paradise.”
Mu'adh b. Jabal reported God’s messenger as saying, “No pair of Muslims will lose three by death without God bringing them into paradise by His great mercy.” He was asked if that applied if they lost two, and said it did. He was also asked if it applied if they lost one, and said it did. Then he said, “By Him in whose hand my soul is, the abortion draws his mother to paradise by his umbilical cord when she seeks her reward for him from God."
Ahmad transmitted it, and Ibn Majah transmitted from “By Him in whose hand my soul is."