Hadith 1298
It is narrated from Sayyiduna Bara’ bin Azib (may Allah be pleased with them both) that the Messenger of Allah (peace and blessings of Allah be upon him) said: “Keep your rows straight so that there may not be discord in your hearts.” The narrator said: And he (peace be upon him) used to say: “Indeed, Allah sends mercy and His angels pray for those in the first row,” or he said: “for those in the first rows.”