Ata bin Abi Rabah narrates: I saw Ibn Umar (may Allah be pleased with them both) pushing a man away from his place of prayer. He (may Allah be pleased with them both) said: I pushed him only so that he would move forward or back.
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الصلاة / 3051