“... The first part of the Book of Isaiah concludes with a jubilant hymn of thanksgiving, written in a very different style from what has gone before, but picking up ‘on that day’ (vv. 1, 4) from chapter 11 (v. 10, 11) and ‘your anger turned away’ (v. 1) from the refrain repeated five times in chapters 5, 9 and 10. The chapter is in the haftarah read in synagogues on the last day of Passover (10:32–12:6). Verses 1–3 are recited at the beginning of the weekly Havdalah service at home marking the end of the Sabbath (ADPB 608–611), and verse 3 is cited in the Talmud in relation to the joy experienced during the water libation ritual on the last day of the Feast of Sukkot (bSukkah 48b, 50b). Jewish interpreters understand the ‘water’ drawn from the wells of salvation as ‘new teaching’ (Tg; cf. Rashi) implying that, when the Messiah comes, some of the laws will become obsolete (RA 669). [...] The Church Fathers, following the Septuagint ‘God is my saviour’ (MT ‘my salvation’ v. 2) and ‘the wells of the saviour’ (MT ‘salvation’), interpreted the ‘wells’ in verse 3 as the Holy Spirit described by Jesus as ‘rivers of living water that flow from the heart’ (John 7:37–39) or the evangelical teaching of Christ ‘springing up to eternal life’ (John 4:13–14; cf. Ps 68:26) (Jerome, Eusebius). ...”