Wikipedia
Safety First
Safety First is a 1926 British silent comedy film directed by Fred Paul and starring Brian Aherne, Queenie Thomas and Mary Brough. It was based on a novel by Margot Neville.
Usage examples of "safety first".
Naturally, all those workarounds would add weight to the aircraft, but, as the man says, safety first.
Kafari slid her own gun into a capacious pocket, being careful to engage the safety first, and tucked Simon's gun into a second pocket.
I understand the need for safety first, but things in Cuba are going to get a lot worse before they get better.