'Sheet' in the Bible

and he saw the sky opened up, and an object like a great sheet descending, lowered by its four corners to the earth,

This happened three times, and then immediately the object was taken up into heaven.

“I was in the city of Joppa praying; and in a trance I saw a vision of an object coming down from heaven, like a huge sheet being lowered by the four corners; and [it descended until] it came right down to me,