12. One should not make any announcement for lost items in the Musjid.

عن أبي هريرة رضي الله عنه قال : قال رسول الله صلى الله عليه وسلم : من سمع رجلا ينشد ضالة في المسجد فليقل : لا ردها الله عليك فإن المساجد لم تبن لهذا (صحيح مسلم رقم 568)

Hazrat Abu Hurairah (radhiyallahu ‘anhu) reports that Rasulullah (sallallahu ‘alaihi wasallam) said, “Whoever hears a person making an announcement for a lost item in the musjid, then he should say ‘Refrain from making these types of announcements in the house of Allah Ta‘ala. However may Allah Ta‘ala return your lost item to you.’ (You should not make these types of announcements in the Masaajid) because the Masaajid were not built for this purpose.”

13. One should not raise one’s voice in the Musjid.

عن السائب بن يزيد قال : كنت نائما في المسجد فحصبني رجل فنظرت فإذا عمر بن الخطاب فقال اذهب فأتني بهذين فجئته بهما فقال : ممن أنتما أو من أين أنتما قالا : من أهل الطائف قال : لو كنتما من أهل المدينة لأوجعتكما ترفعان أصواتكما في مسجد رسول الله صلى الله عليه وسلم (صحيح البخاري رقم 470)

Hazrat Saa’ib bin Yazeed (radhiyallahu ‘anhu) reports, “On one occasion I was asleep in the Musjid when suddenly someone came and threw some pebbles on me. I looked and saw that it was Hazrat ‘Umar (radhiyallahu ‘anhu). He said to me ‘Go to these two people and bring them to me.’ I brought them before him, and he asked them, ‘Where are you two people from?’ They replied that they were from Taa’if. Hazrat ‘Umar (radhiyallahu ‘anhu) replied, ‘Had you been from the people of Madinah Munawwarah I would have punished you severely. You are raising your voices in the Musjid of Rasulullah (sallallahu ‘alaihi wasallam)!’”

14. Ensure that you switch off your cellphone when you enter the Musjid so that it does not cause a disturbance to those performing salaah. Do not take photos while in the Musjid. Taking photos of animate objects are haraam in Islam and taking photos in the Musjid is a greater sin.

عن عبد الله رضي الله عنه قال : سمعت النبي صلى الله عليه وسلم قال : إن أشد الناس عذابا عند الله يوم القيامة المصورون (صحيح البخاري رقم 5950)

Hazrat ‘Abdullah bin Mas’ood (radhiyallahu ‘anhu) reports that Rasulullah (sallallahu ‘alaihi wasallam) said, “Those involved in picture-making will be subjected to the worst forms of punishment on the day of Qiyaamah