Arcana Coelestia#3772
3772. 'And water the flock' means that the doctrine was drawn from it. This is clear from the meaning of 'watering', or giving a drink, as giving instruction, dealt with in 3069, 3768, and from the meaning of 'the flock' as people who are governed by the goods and truths of faith, dealt with in 343, 3767. Thus 'watering it' means giving instruction from the Word, and therefore from doctrine.
Arcana Coelestia#3771
3771. 'And they would roll the stone from over the mouth of the well' means that they opened it up. This is clear from what has been stated just above in 3769 about the meaning of 'a large stone over the mouth of the well' as the fact that the Word was closed up. From this it is evident that 'they would roll the stone from over the mouth of the well' means that they opened it up.