In the time of the Prophet ﷺ we used to regard miraculous signs as blessings, but you regard them as warnings meant to frighten.
حدثنا معاوية بن هشام حدثنا سفيان عن الأعمش عن إبراهيم عن علقمة
كنا نرى الآيات في زمان النبي ﷺ بركات وأنتم ترونها تخويفا
No references are available.
Its isnad is sahih. It will come at greater length at 4393. The longer version was narrated by Bukhari, 6:432-433, through the route of Mansur from Ibrahim.