Vine's Expository Dictionary of NT Words
"to make secure, safe, firm" (akin to asphales, "safe"), (a, negative, and sphallo, "to trip up"), is translated "make ... fast," in Acts 16:24 , of prisoners' feet in the stocks. In Matthew 27:64,65,66 , it is rendered "to make sure." See SURE.Note: For HOLD (fast) and STAND (fast), see HOLD and STAND, No. 7.
These files are public domain.
Vines, W. E., M. A. Entry for 'Fast'. Vine's Expository Dictionary of NT Words. https://www.studylight.org/dictionaries/eng/ved/f/fast.html. 1940.