Abu Uthman Hindi says: A letter came to us from Sayyiduna Umar (may Allah be pleased with him); we were with Sayyiduna Utbah bin Farqad (may Allah be pleased with him) in Azerbaijan or Syria. In that letter, it was written: "As for what follows! The Noble Prophet (peace and blessings be upon him) forbade wearing silk, except for the width of two fingers." Abu Uthman says: We understood that (by two fingers it means) that stripes or marks of silk of that width are permissible.