It is narrated from Qays bin Abi Hazim that Sayyiduna Umar (may Allah be pleased with him) said: If I were able to give the call to prayer along with (the duties of) the caliphate, I would certainly give the call to prayer.
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الصلاة / 2041