20. When walking in the musjid, be careful one does not cross in front of someone performing salaah.

عن أبي جهيم رضي الله عنه قال قال رسول الله صلى الله عليه وسلم لو يعلم المار بين يدي المصلي ماذا عليه لكان أن يقف أربعين خيرا له من أن يمر بين يديه قال أبو النضر لا أدري أقال أربعين يوما أو شهرا أو سنة (صحيح البخاري رقم 510)

Hazrat Abu Juhaim (radhiyallahu ‘anhu) reports that Rasulullah (sallallahu ‘alaihi wasallam) said, “If the one walking in front of a musalli had only known the severity of his action, for him to wait for forty will be better for him than passing in front of him.” Abu Nadhr says, “I do not know whether he said forty days, forty months or forty years.” (In other Ahaadith, mention is made of forty years.)

21. Do not perform salaah in such a place in the Musjid that the free movement of the Musallees is impeded e.g. performing salaah at the entrance, thus preventing others from passing.

عن ابن عمر رضي الله عنهما أن رسول الله صلى الله عليه وسلم نهى أن يصلي في سبعة مواطن … وقارعة الطريق … (سنن الترمذي رقم 346)

Hazrat ibnu ‘Umar (radhiyallahu ‘anhuma) reports that Rasulullah (sallallahu ‘alaihi wasallam) prohibited performing salaah in seven places; (and from them is) on the pathway.