The correct phrase is "he arrived safe and sound."
In this phrase, "safe and sound" is an idiomatic expression that means someone or something arrived without harm or injury. The word "safe" indicates that the person or thing arrived without danger or harm, while "sound" implies that they arrived in good condition or health.
The verb "arrived" is in the past tense to indicate that the arrival has already taken place. Therefore, the correct form is "arrived" and not "arrive."
Here's the correct phrase: "He arrived safe and sound."