Does sottapana have perfect morality (sila)? Someone told me the other day that a Sotapanna has perfect morality, particularly five precepts. I think I did read somewhere a Sotapanna has perfect morality but I forget the source. Can someone refer me to any source that says a Sotapanna has perfect sila?
No, just an Arahat has such. But a Streamwinner has what is called "virtue pleasing and praised by the wise". Not capable to make grave faults and lead deliberate misconduct. In affect he/she is still able to conduct unskillful deeds, but would not hide it and leave them covered, would confess them quick, be ashamed and intent to correct.

(You may find the wish after resources, there where you lead the discussion and try to argue on other place.)

[Note: This is a gift of Dhamma, not meant for commercial use or other lower wordily gains by ways of exchange or trade]