Is there a Hadith indicating that Satan penetrates the gaps between worshipers, and what is meant by these gaps, and how do we respond to those who cast doubt on that and on the Hadith, "No man is alone with a woman but Satan is the third of them," on the pretext that Satan is always with humans?

The Sunnah (definition) in congregational prayer is to straighten the rows such that foot is aligned with foot and shoulder with shoulder, and to stand close together. The Prophet, peace and blessings be upon him, commanded this and warned against not straightening them, informing that Satan enters between worshipers if they leave a gap. Authentic hadiths have been reported affirming the importance of straightening the rows and that it is part of establishing the prayer, and that Satan enters through unaligned rows. It is natural for Satan to be eager to corrupt worship and lead people into disobedience.