But no one is able to enter into the house of the strong man and plunder his property unless he first ties up the strong man, and then he can plunder his house. Bible other translations

“ties up.” The word “ties up” (deō) was a common word for bind, “tie up,” and one of its uses was “to describe the ‘binding’ power of curses” (Moulton and Milligan, Vocabulary of the Greek NT). The context is the casting out of demons (v. 28), so the “binding” in this verse refers to binding a demon and making it powerless by the power of God. See commentary on Matthew 12:29.

Commentary for: Mark 3:27