in faith: see FAITH sb. 12 b.

1

15[?].  Chevy Chase, II. 124. ‘Such A-nothar captayn skotland within,’ he sayd, ‘ye-feth shuld neuer be.’

2

a. 1596.  Sir T. More, I. ii. 152. Yfaith, yfaith, they are too short for me.

3

1607.  Y’faith [see FAITH sb. 12 b].

4

1619.  Drayton, Heroic. Ep., xiii. 108. Yfaith her Queeneship little Rest should take.

5