السيد
كلمة (السيد) في اللغة صيغة مبالغة من السيادة أو السُّؤْدَد،...
Abu Hurayrah (may Allah be pleased with him) reported that the Prophet (may Allah's peace and blessings be upon him) said: "Allah does not accept the prayer of anyone of you who is in the state of Hadath (minor ritual impurity), until he performs ablution."
شرح الحديث :
The wise legislator ordered that anyone who wants to pray must only pray when they are in a good and a beautiful state, because prayer is the firmly established connection between the Lord and His servant. It is the servant's channel to have a confidential talk with Allah. So Muslims are ordered to perform ablution and be free from impurities during prayer, and informed that without purification, the prayer is rejected and not accepted.