Sayyiduna Imran bin Husayn (may Allah be pleased with him) narrates that the Prophet (peace and blessings be upon him) said: "Whoever is summoned to one of the Muslim rulers and does not come to him is a wrongdoer." (The narrator is unsure; perhaps the words are:) He said: "He will have no right."
Al-Bazzar recorded it; its chain contains Rawh bin Ata bin Abi Maymunah, who is da'if (weak), though Ibn Adi declared him thiqah (trustworthy).
Hadith Referenceمجمع الزوائد ومنبع الفوائد / كتاب الأحكام / 7019