Note: Laughing Loudly, Not Smiling, Is One Of The Things That Invalidate One's Prayer, Avoid It As Much As Possible

💐 In The Name Of Allah The Most Gracious The Most Merciful

📜 Question: Does smiling invalidate the prayer? (If a person is about to laugh but restrains their laughter and smiles instead while praying, do they have to pray again?)

📝 Answer: It (smiling) does not invalidate the prayer. While smiling does not break one's prayer, laughing (or giggling) is among the things which invalidate one's prayer. Laughter with clear sound (that is audible) is what invalidates the prayer. Talking or having a dialogue with others while one is aware of its prohibition while praying also invalidates one's prayer. [So if a person only smiles, without laughing aloud, they can continue praying.]

From the Fataawa of sheikh AbdulAziz Ibn Baz (May Allah have mercy on him. Ameen.)

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Some possible reasons why a Muslim may smile while praying: 

1] Hearing someone hiccup loudly while saying "Ameen" if praying in the Masjid and in congregation. 

2] Somehow noticing someone's toddler standing right in front of you, staring for several minutes and patting your head when you perform Sujood. 

3] Overhearing a funny conversation between some children who haven't reached the age yet when kids are obliged to pray (around ten years old or when they have seen the signs of puberty).

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https://binbaz.org.sa/fatwas/8749/%D8%AD%D9%83%D9%85-%D8%A7%D9%84%D8%AA%D8%A8%D8%B3%D9%85-%D9%81%D9%8A-%D8%A7%D9%84%D8%B5%D9%84%D8%A7%D8%A9

https://m.youtube.com/watch?v=7ygMQwh4A-k

Note: It Is Preferable To Use One's Right Hand When Holding, Carrying, Giving And Receiving.

💐 In The Name Of Allah The Most Gracious The Most Merciful

📜 Question: Is it allowed to hold the Mushaf (Copy of the Noble Qur'an) with the left hand?

📝 Answer: I do not know if there is any issue with this thing, however holding the Mushaf and carrying it with the right hand is better. Using the right hand is more preferable as the noble Messenger Muhammad SallAllahu 'alaihi wa sallam used his right hand (or began doing most, if not all, activities from his right hand) when it came to purification, wearing his shoes, in giving and receiving, and so forth. If there is a necessity for the person to use their left hand to carry and hold, say because their right hand is tired or temporarily it can't be used for lifting, or they are using their right hand for another purpose and the like, then 

Inn-sha-Allah there is no problem in using the left hand for carrying. It is still recommended to use the right hand (to be closer to following the Sunnah of the beloved Prophet Muhammad SallAllahu 'alaihi wa sallam).

From the Fataawa of sheikh AbdulAziz Ibn Baz (May Allah have mercy on him. Ameen.)

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📖 Aisha RadhiAllahu ‘anha narrated: The Messenger Muhammad SallAllahu 'alaihi wa sallam liked to begin from his right side when putting on his shoes, combing his hair, performing his ablution, and in all of his affairs.

Source: Sahih Al-Bukhari 166 

Sahih Muslim 268

Grade: Muttafaqun Alayhi (Authenticity agreed upon) according to Al-Bukhari and Muslim

📖 Ibn Umar RadhiAllahu 'anhu narrated: Allah’s noble Messenger Muhammad SallAllahu 'alaihi wa sallam said, "When one of you eats, let him eat with his right hand. When he drinks, let him drink with his right hand. Verily, the devil (shaytaan) eats and drinks with his left hand."

Source: Sahih Muslim 2020

Grade: Sahih (Authentic) according to Muslim

https://binbaz.org.sa/fatwas/4493/%D8%AD%D9%83%D9%85-%D8%A7%D8%AE%D8%B0-%D8%A7%D9%84%D9%85%D8%B5%D8%AD%D9%81-%D8%A8%D8%A7%D9%84%D9%8A%D8%AF-%D8%A7%D9%84%D9%8A%D8%B3%D8%B1%D9%89