المؤخر
كلمة (المؤخِّر) في اللغة اسم فاعل من التأخير، وهو نقيض التقديم،...
Jābir ibn ‘Abdullāh (may Allah be pleased with him) reported that the Messenger of Allah (may Allah's peace and blessings be upon him) used to stick to the rear while traveling, urging the weak to walk quickly, letting some ride behind him, and making supplication for them.
شرح الحديث :
The Hadīth means that the Messenger of Allah (may Allah's peace and blessings be upon him) used to join the last group of travelers while being on a journey. He used to do so in order to check on people and those in need of help, such as the impotent and those needing a ride. Also, he used to encourage the weak person to move quickly, take up someone behind him, and supplicate for him.