This surah is ‘makki’ and it has 83 verses. It is written in the
commentary of Majma’ul Bayan whoever recites surah Yaseen solely for
seeking the pleasure of Allah (swt), all his sins will be forgiven
and he will be given the reward equal to the reward of reciting the
whole Qur’an 12 times.

If this surah is recited near a person on his deathbed, then for each
letter recited, 12 angels are sent to pray for his forgiveness and
they remain even when the soul is being taken by the Angel of Death.
The angels also  take part in his funeral rites.

If recited near a person who is in Sakarat-ul-Mawt (on the verge of
passing away), then an angel brings a drink for the dying person from
Jannah and as he drinks of it, he feels greatly eased.

In another narration, this surah has been described as the key to all
good in this life and in the hereafter and a safety from all evil in
this life and in the hereafter. Needs are fulfilled if asked after the
recitation of this surah and the reward for its recitation is also
compared to performing twenty hajj pilgrimages.

Drinking the water in which this surah has been dissolved cures one of
a thousand types of illnesses. The Holy Prophet (saw) said that
everything has its heart and the heart of the Holy Qur’an is surah
Yaseen.

He (SAWW) also said that if this surah is recited in a graveyard then
all punishment is lifted, for that day, from all the graves and the
recitor gets the reward equal to the sum of all the good actions
performed by all those who are buried in that graveyard.
It is narrated from Imam Ja’far as-Sadiq (as) that whoever recited
this surah in the morning will be protected from all calamities and
problems during the day and whoever recites it at night will be
protected from Shaitan by seventy thousand angels.

Recitation of this surah saves one from the squeezing of the grave and
its other torments. Passing the difficult stages in the hereafter will
also be made easy for him.

The sixth Imam (as) also said that drinking this surah after writing
it in a mixture of rose water and saffron for seven days (it has to be
written once for each day) makes a person have such a good memory that
he will never forget what he hears. He will win debates and will gain
great respect and status.  If given to a woman, her breast-milk will
increase.

Keeping this surah in one’s possession as a talisman acts as a
protection from the jealousy of people. The wearer remains safe from
the evil designs of men and Jinn. It also acts as a cure from disease.