وعليكم السلام ^^ in Arabic we do not say يا أخ ويا أخوان because if you want to talk to plural just say إخوان = for males أخوات = for women so, we say يا إخوان ويا أخوات and no need for singular = يا اخ شكرا خزيرا× شكرا جزيلا i did not understand your question but i will try to help you with what i know =) This saying for a Muslim president, his name is Omar bin Abdul Aziz . he is the fifth rulers after the death of the Prophet Muhammad peace be upon him The story of this saying is that his son and his brother and servant are died after each other in short time between them ,But he was patient and he did not complain and he accept the reality and destiny .Because in Islam you will get a great reward from God if be patient in disasters and you do not make your life end because you're sad and just accept the reality So, one of the people who were in mourning told him جزاك الله عن الإسلام خيرا يا أمير المؤمنين This means that God will give you a great reward for your application Islam But he said بل جزى الله الإسلام عني خيرا God will give Islam great reward because it made ​​me like this العفو