What is the ruling on one who enters the mosque and prays in the second row while there is a gap in the first row?

Question:
Honorable Shaykh, may Allah grant you success. He says: If I enter the mosque and the imam is bowing, and the people have lined up in the second row, and the third row is not yet complete when I enter. If I enter the mosque and the imam is bowing, and the people have lined up in the second row, and the first row is not yet complete, he says: So do I have the right to line up with the people in the second row, or am I required to go to the far end of the first row, and perhaps I will miss the rak'ah?

Answer:
Yes, you should strive to reach the gap to fill it, and they are the ones who did wrong by not filling it; they have dropped their right, so you may step over them to go to this gap to fill it, and great virtue has been mentioned regarding this, yes.