السيد
كلمة (السيد) في اللغة صيغة مبالغة من السيادة أو السُّؤْدَد،...
Thawbān (may Allah be pleased with him) reported: When the Messenger of Allah (may Allah's peace and blessings be upon him) finished his prayer, he would seek Allah’s forgiveness three times; then say: "O Allah, You are the One free from imperfections, and peace and perfection come from You. Blessed are You, the Owner of Majesty and Honor."
The Hadīth indicates that it is recommended for a person offering the prayer to say after he finishes: “I seek Allah’s forgiveness" three times, then say the following supplication: “O Allah, You are the One free from imperfections, and peace and perfection come from You. Blessed are You, the Owner of Majesty and Honor." There are other supplications reported in other Hadīths to be said after finishing the prayer.