From G4862 and G5083; to keep closely {together} that {is} (by implication) to conserve (from ruin); mentally to remember (and obey): - {keep} {observe} preserve.
Middle voice from G4862 and G5087; to place {jointly} that {is} (figuratively) to consent ({bargain} {stipulate}) concur: - agree {assent} covenant.
Verse
Matrix
Mat 9:17Neither do men put new wine into old bottles: else the bottles break, and the wine runneth out, and the bottles perish: but they put new wine into new bottles, and both are preservedG4933.
Mar 6:20For Herod feared John, knowing that he was a just man and an holy, and observedG4933 him; and when he heard him, he did many things, and heard him gladly.