Would you have a better guess that the opening verses in Hebrews 12?
What am I supposed to guess about; what the WITNESSES are?
Hebrews 12:1-2
Therefore, since we are surrounded by such a great cloud of witnesses, let us throw off everything that hinders and the sin that so easily entangles. And let us run with perseverance the race marked out for us, fixing our eyes on Jesus, the pioneer and perfecter of faith.