It is narrated from Sayyiduna Marthad bin Abi Marthad al-Ghanawi (may Allah be pleased with him) - who was one of the Companions who fought at Badr - that the Messenger of Allah (peace and blessings be upon him) said: "If it pleases you that your prayer be accepted, then let the best of you lead you in prayer, for they are your representatives between you and your Lord."
Hadith Referenceالمعجم الكبير للطبراني / باب الميم / 17908
It is narrated from Sayyiduna Marthad (may Allah be pleased with him) - who was one of the Companions of the Prophet (peace and blessings be upon him) - he said: "Allah drew two lines in His Book, then He raised the pen; in one of them He wrote the creation, and in the other He wrote what the creation will do."
Hadith Referenceالمعجم الكبير للطبراني / باب الميم / 17909