Oecumenius — on Rev 10:2 (Commentary on Revelation)

“And he is said to have held in his hand a tiny open scroll [βιβλιδάριον]. Daniel, recalling such small scrolls [βιβλίων], says: "before him sat a judge, and scrolls [βίβλοι] were opened." (Dan. 7:10) The tiny scroll [βιβλιδάριον] was one in which were recorded the names and the multitude of the very impious who were to be punished. Therefore, it was also diminutively called a "tiny scroll" [βιβλιδάριον], since it is a kind of scroll [βίβλου]. Both terms have been used in the Holy Scripture, in which the names of all men are written, according to what was previously stated by me. The term "tiny scroll" [βιβλιδάριον] refers to the record containing the names of the exceedingly impious. For the worshippers of idols were not so numerous, nor marked by murders and poisonings and other afflictions that would serve to fill an entire scroll small [βιβλίον] with the diseases they caused. And he set his right foot upon the sea, and his left foot on the land. This was a sign both of the greatness of the saints and a sign that those who have sinned on the earth as well as those in the sea, such as shipwrecked individuals or others who have committed evil deeds, would bear the consequences of punishment.”