I pledge you in this wine- i.e. I drink to your health or success.
Drink to me only with thine eyes, And I will pledge with mine.
Ben Jonson (translated from Philostratus) second century.
If I Were a huge man, I should fear to drink at meals, Lest they should spy my windpipe's dangerous notes. Great men should drink with harness on their throats.
Timon of Athens, i.2.
Source: Dictionary of Phrase and Fable, E. Cobham Brewer, 1894