#05AB1E, 6 5 bytes
05AB1E, 6 5 bytes
Thanks to Downgoat for saving 1 byte. Code:
ADv=À Explanation:
A # Push the lowercase alphabet. D # Duplicate it. v # For each in the alphabet... = # Print without popping and with a newline. À # Rotate 1 to the left. Uses the CP-1252 encoding. Try it online!.