1549 T. Solme in H. Latimer sig. C.vii (margin) Goddes boke hath bene preserued hyther to by a wonderful myracle, no God a mercy vnto the bysshoppes.
a1567 L. Nowell (1952) 166/2 Toȝyfes, gratis; of free cost, for nothing, for God a mercy.
1569 N. Haward tr. Seneca xii. f. 29v A great multitude of them are not woorth godamercies.
1600 P. Holland tr. Livy xxix. 712 He would be readie to assist him with such a power of foote and horse as were worth god amercy [L. haud contemnendis].
a1617 P. Baynes (1643) 130 For to choose one out of grace to have this or that hee shall well pay for, is grace not worth God have mercy.
1626 J. Mede Let. 3 June in H. Ellis (1824) 1st Ser. III. 230 If we stayed to expect the event in Parliament, it would not be worth ‘God-ha-mercy!’
1628 H. Burton 32 And then no Godamercy to his Popery, or to his silly ignorance.
1631 J. Shirley iii. 42 I ambled to the bed of a Parsons wife that was coltish once, and gaue her husband a Horse for't in good fashion, he neuer gaue me godamercie for't.
1692 R. L'Estrange (1694) 265 Dost think I have so little wit as to part with such a Gob of money for God-a-mercy?
1699 A. Boyer (at cited word) For God-a-mercy, Pour un Dieu vous le rende, pour rien.
1719 C. R. Dufresny clxvi. 130 Dost thou think I have so little wit as to part with such a Gob of Money for a God-a-mercy?
a1825 R. Forby (1830) 135 God-ha'mercy, something to be considered as a blessing granted to prayer. Ex. ‘That was no God-ha'mercy of yours.’ That is, I..owe you no thanks for your prayers to obtain it.
?1847 50/1 Tom wants no summoning; but, leaping up, with a ‘God a mercy’, hurries off to the log-house.
1932 R. Macaulay i. xiii. 101 I cry him mercy for my sins, and give him God-a-mercy for his kindness.
1954 I. Bashevis Singer in I. Howe & E. Greenberg 404 The master of revels made a ‘God 'a mercy’ in memory of the bride's parents.