During the lifetime of the Messenger of Allah ﷺ, when a person stood to pray, his gaze would not go beyond the place of his feet. When the Messenger of Allah ﷺ passed away, when a person stood to pray, his gaze would not go beyond the place where his forehead would rest in prostration. Then Abu Bakr passed away, and during the time of Umar, when a person stood to pray, his gaze would not go beyond the direction of the qiblah. Then came the time of Uthman bin Affan, and the period of trial began, so people began looking around to their right and left.
حدثنا إبراهيم بن المنذر الحزامي حدثنا خالي محمد ابن إبراهيم بن المطلب بن السائب بن أبي وداعة السهمي حدثني موسى بن عبد الله بن أبي أمية المخزومي حدثني مصعب بن عبد الله
كان الناس في عهد رسول الله ﷺ إذا قام المصلي يصلي لم يعد بصر أحدهم موضع قدميه فلما توفي رسول الله ﷺ فكان الناس إذا قام أحدهم يصلي لم يعد بصر أحدهم موضع جبينه فتوفي أبو بكر وكان عمر فكان الناس إذا قام أحدهم يصلي لم يعد بصر أحدهم موضع القبلة وكان عثمان بن عفان فكانت الفتنة فتلفت الناس يمينا وشمالا
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[Its isnad is daif] * Musa bin Abdullah is majhul (Taqrib Tahdhib, p. 982, edited by Abu Ashbal), and Busiri said, "I have not seen anyone discredit him or affirm his reliability."