Who are the bearers of the titles: Sayyid al-Ulama (Master of Scholars), Sayyid al-Qurra (Master of Reciters), Sayyid al-Tabi'in (Master of the Successors), Khayr al-Tabi'in (Best of the Successors), and Abu al-Masakin (Father of the Needy)?

"Sayyid al-Ulama" (Master of Scholars) was a title given to Ayyub al-Sakhtiyani and Abdullah ibn al-Mubarak. Ubayy ibn Ka'b (may Allah be pleased with him) was known as "Sayyid al-Qurra'" (Master of Reciters) because the Prophet (peace and blessings be upon him) said: "The most skilled reciter among you is Ubayy." Sa'id ibn al-Musayyab was described as "Sayyid al-Tabi'in" (Master of the Successors). Uwais al-Qarani (may Allah be pleased with him) was known as "Khair al-Tabi'in" (The Best of the Successors). Ja'far ibn Abi Talib (may Allah be pleased with him) was titled "Abu al-Masakin" (Father of the Poor).