What is the meaning of Allah Almighty's saying in Surat Tabarak, "None can withhold them except the Most Gracious," in verse 19?

The phrase mentioned is part of verse (Al-Mulk: 19), and it appears in the context of addressing the disbelievers who denied the message of Muhammad, peace be upon him, drawing their attention to the power of Allah the Almighty in a rhetorical interrogative style. The meaning is: Did they not look with consideration at the birds above them, spreading and folding their wings? None holds them in the air except Allah, the Exalted. He is All-Seeing of everything. So, Allah, the Almighty, who made the earth subservient to mankind, also made the air subservient to birds, and it is He who sustains all through harmonious laws.