Musannaf Ibn Abi Shaybah 33686 — A slave who married a free woman

Al-Sha'bi reports from Sayyiduna Umar, Ali, Abdullah and Zayd (may Allah be pleased with them) that they used to say: When a man attains freedom and has children from a free woman, he will draw their wala' to himself. The narrator said: I said to al-Sha'bi: What is the ruling on the grandfather? He said: The grandfather draws the wala' to himself just as the father does.