'Thread' in the Bible

If he has been healed, then the priest is to command that two live and clean birds, some cedar wood, some crimson thread, and hyssop be brought for the one cleansed.

He is to take the live bird, the cedar wood, the crimson thread, and the hyssop, and dip them together in the blood of the bird that had been slaughtered over the flowing water.

He is to clean the house with the blood of the bird over flowing water, including cleansing the live bird, the cedar wood, the hyssop, and the crimson thread.