In this paper reling on Agamben’s genealogical endeavour with regard to the concept of oath, I shall try to discuss how he renders the relation between language and the destituent power that will lead me to address ‘the new experience of the word’, namely, pistis (faith), which is placed at the centre of the messianic announcement. In order to open up this point, I will take into consideration Jacques Derrida’s arguments related to faith and language which appear to be one (...) of the main addressees of Agamben’s critical undertaking, even though he is never mentioned in Agamben’s later book The Sacrament of Language, in which he elaborates the contours of the relation between language and pistis. For Derrida the opening of language is based on an oath, a promise of saying ‘yes’ and thus, speaking is an act of faith. However, it is this functioning of language that has to be suspended according to Agamben, since it is this very dispositif that is connected to sovereign power. It is through this suspension the living being who has language may cease to be homo sacer before language and sovereign power. (shrink)