'Observe' in the Bible

all, then, as much as they may say to you to observe, observe and do, but according to their works do not, for they say, and do not;

'Whenever, therefore, ye may see the abomination of the desolation, that was spoken of through Daniel the prophet, standing in the holy place (whoever is reading let him observe)

teaching them to observe all, whatever I did command you,) and lo, I am with you all the days -- till the full end of the age.'