Hadiths 1.43 & 1.44

1.43:
Narrated `Umar bin Al−Khattab: Once a Jew said to me, "O the
chief of believers! There is a verse in your Holy Book Which
is read by all of you (Muslims), and had it been revealed to
us, we would have taken that day (on which it was revealed as
a day of celebration." `Umar bin Al−Khattab asked, "Which is
that verse?" The Jew replied, "This day I have perfected your
religion For you, completed My favor upon you, And have chosen
for you Islam as your religion." (5:3) `Umar replied, "No
doubt, we know when and where this verse was revealed to the
Prophet. It was Friday and the Prophet was standing at `Arafat
(i.e. the Day of Hajj)"

1.44:
Narrated Talha bin 'Ubaidullah: A man from Najd with unkempt
hair came to Allah's Apostle and we heard his loud voice but
could not understand what he was saying, till he came near and
then we came to know that he was asking about Islam. Allah's
Apostle said, "You have to offer prayers perfectly five times
in a day and night (24 hours)." The man asked, "Is there any
more (praying)?" Allah's Apostle replied, "No, but if you want
to offer the Nawafil prayers (you can)." Allah's Apostle
further said to him: "You have to observe fasts during the
month of Ramadan." The man asked, "Is there any more fasting?"
Allah's Apostle replied, "No, but if you want to observe the
Nawafil fasts (you can.)" Then Allah's Apostle further said to
him, "You have to pay the Zakat (obligatory charity)." The man
asked, "Is there any thing other than the Zakat for me to
pay?" Allah's Apostle replied, "No, unless you want to give
alms of your own." And then that man retreated saying, "By
Allah! I will neither do less nor more than this." Allah's
Apostle said, "If what he said is true, then he will be
successful (i.e. he will be granted Paradise)."