You can get a bank letter from ICICI and also Axis bank 6 months statement (stamped by bank) showing that these funds are not a loan amount. The funds must be at least 6 months old or you will need to show more proof (Eg: salary deposits, FD redeemed, shares sold)
In your LOE, you must say that the reason for huge fund inflow into ICICI bank account was due to transfer from another bank (axis) and not a loan