Entity Framework Core (7): load single entity by id

.ToListAsync is used to get a collection of items from DB in EF Core. That's clear. But what is the right way to get single item? In async way if possible.

public async static Task<Source> LoadEntityAsync(int sourceID)
{
    using (var db = new RPDBContext())
    {
        var sources =
            await
                db.Source
                    .Where(x => x.SourceID == sourceID)
                    .ToListAsync();
        // TODO that's like a hack:
        return sources.First();
    }
}