You can’t. Passwords are hashed using a one-way hashing function, bcrypt (via PHP’s password_hash function). The whole point is exactly so that you can’t get the passwords (if your server/database was hacked for example).
You don’t say exactly why you want to see their passwords but if a user has forgotten their password they can reset it. If that’s a problem for some reason you can generate a bcrypt hash using a known password and put that hash into the appropriate database field.