Only one in a state of ablution should call to prayer.
حدثنا يحيى بن موسى حدثنا عبد الله بن وهب عن يونس عن ابن شهاب قال
لا ينادي بالصلاة إلا متوضئ
No references are available.
This hadith is daif and munqati (disconnected). It was also related by Ibn Abu Shayba: 1/211, no. 2195, from the hadith of Zuhri with the same wording.