Hadith 505100
Chapter 15: The Qur'an - كتاب القرآن
وَحَدَّثَنِي عَنْ مَالِكٍ، عَنْ يَحْيَى بْنِ سَعِيدٍ، أَنَّ سَعِيدَ بْنَ الْمُسَيَّبِ، كَانَ يَقُولُ إِنَّ الرَّجُلَ لَيُرْفَعُ بِدُعَاءِ وَلَدِهِ مِنْ بَعْدِهِ وَقَالَ بِيَدَيْهِ نَحْوَ السَّمَاءِ فَرَفَعَهُمَا .
Yahya related to me from Malik from Yahya ibn Said that Said ibn al-Musayyab used to say, "A man is raised by the dua of his son after his death." He spoke with his hands turned upwards, and then lifted them up.
Reference Muwatta Malik 505100
USC-MSA web (English) reference : Book 15, Hadith 38