Question

"Allah is there and in his presence i am giving u this money "why did Ali make this remark in his conversation with one of the post office clerks

Answer 1

Ali said that Allah is watching them and Ali gave him money for the happiness of Allah

Answer 2

Ali make his remark in his conversation with one of the post office clerk , because he did not want to embarrass that person, he was giving to money .so he clearly said I am giving this money to you in presence of Allah..