Abdullah bin Abdur Rahman says that I have come to know this saying of Hazrat Luqman (peace be upon him) that he said to his son: "Son! Do not acquire knowledge so that you may boast over the scholars through it, or argue with the ignorant and foolish, or make yourself prominent in gatherings." Then he narrated this hadith of Sayyiduna Saeed bin Zaid (may Allah be pleased with him) that the Messenger of Allah (peace and blessings be upon him) said: "The greatest usury is to unjustly violate the honor of a Muslim. The womb (kinship) is a branch of the Most Merciful. Whoever severs kinship, Allah will make Paradise forbidden for him."