It is not necessary for the lessor and the lessee to say a particular formula (ṣīghah) [for a rental agreement to be valid (ṣaḥīḥ), nor does it have to be] in Arabic; rather, if the owner says to someone [in English, for example], ‘I rent my property to you’, and the other person says, ‘I accept’, the rental agreement is valid.
In fact, even if they do not say anything and the owner simply hands over the property to the lessee with the intention (qaṣd) of giving his property on rent to him, and the lessee accepts it with the intention of renting it, the rental agreement is valid.