herewith
adverb law formal or specialized uk/ˌhɪəˈwɪð/ /ˌhɪəˈwɪθ/ us/ˌhɪrˈwɪð/ /ˈhɪr.wɪð/
与此（信件或文件）一起，随函附上
together with this letter or other official written material
I enclose three documents herewith. 随函附上3份文件。
Compare: therewith hereby