Bede

The name of his firstborn son was Joel, etc. Joel means 'beginning' or 'was of God', Abia stands for 'father', and Beersheba means 'well of the oath'. It is indeed a place, as the name itself proves, where Abraham and Isaac made a covenant with Abimelech by swearing; this signifies that very fountain of salvation, which, united in the pact of one and the same faith, washes those circumcised and uncircumcised; in which the aforementioned brothers are appointed as judges so that they may both offer and drink the fountain of life. …

Commentary on Samuel ↗