Musnad Ahmad 33:570

Hassan narrated to us, Ibn Lahi'ah narrated to us, Abu al-Zubayr narrated to us, from Jabir, that the Messenger of Allah (may Allah bless him and grant him peace) said: "Let no one among you make his brother stand up on the day of Friday, then move to his seat and sit in it. But rather, let him say: 'Make space.'"