Harith bin Suwayd narrates: Sayyiduna Abdullah (may Allah be pleased with him) used to say: Keep the prayer short, for behind you are the elderly, the weak and people with work to attend to. When we offered the Fajr prayer behind our imam, our clothes would be on our bodies, and the imam would recite one of the surahs of about a hundred verses; then we would go to Sayyiduna Abdullah (may Allah be pleased with him) and find him still in prayer.
Imam al-Tabarani recorded it, and its narrators are the narrators of the "Sahih".
Hadith Referenceمجمع الزوائد ومنبع الفوائد / كتاب الصلاة / 1774