We had in fact thought that men and jinns would never speak a lie about God,

‘Whereas we thought that men and jinns would never fabricate a lie against Allah!’

and we had thought that men and jinn would never speak against God a lie.

and that [we were mistaken when] we thought that neither man nor [any of] the invisible forces would ever tell a lie about God.

And verily we! we had imagined that humankind and Jinn would never forge against Allah a lie.

'And verily, we thought that men and jinns would not utter a lie against Allah.

And we thought that humans and jinn would never utter lies about God.

And we thought that humans and jinn would never utter lies about Allah.

And we had thought that humans and jinn would never speak lies about God.

And we had thought that humans and jinn would never speak lies about Allah.

We certainly thought that humans and jinn would never speak lies about Allah.

and that “we had thought that men and jinn would never speak a lie about Allah”,

`And verily, we thought that men and Jinn would not utter a lie against Allah.'

And lo! we had supposed that humankind and jinn would not speak a lie concerning Allah -

We thought that humans and jinn would never utter any falsehood concerning Allah.

we never thought that either human or jinn would ever tell a lie against Allah!'

And we had thought that mankind and the jinn would never speak about Allah a lie.

We thought that no man or jinn could ever tell lies about God.

And that we thought that men and jinn did not utter a lie against Allah:

Waanna thananna an lan taqoola alinsu waaljinnu AAala Allahi kathiban

wa-annā ẓanannā an lan taqūla l-insu wal-jinu ʿalā l-lahi kadhiban

We had supposed that men and jinn would never utter a lie against God.

'But we do think that no man or spirit should say aught that untrue against Allah.