Q 1: I heard that Allaah’s Messenger (sallallaahu ‘alaihi wa sallam) said in a Hadeeth: 
love the ‘Arabic language for three (reasons): It is the language of the Qur’an, the language of Paradise and my mother tongue. 
Is this Hadeeth authentic?
The Hadeeth you ask about was not related in this wording, but it was related in the wording: Love ‘Arabs for three (reasons): I am an ‘Arabian, Qur’aan was (revealed in) ‘Arabic, and the language of people of Paradise is ‘Arabic. It was narrated by At-Tabaraani in his book Al-Mu`jam Al-Kabeer and Al-Mu`jam Al-Awsat on the authority of Ibn `Abbaas (radhiyallaahu ‘anhumaa).
It was also related by As-Suyooti in his book Ad-Durar Al-Muntathirah. However, this Hadeeth is extremely weak and some scholars of the science of Hadeeth deemed it as Mawdu` (fabricated) such as Abu Haatim, Al-`Uqayly, Ibn Al-Jawzi in his book Al-Mawdu`at. Al-Haythami mentioned the Hadeeth in his book Majma` Az-Zawa’id and commented: It is related by Al-Tabarani in Al-Mu`jam Al-Kabir and Al-Mu`jam Al-Awsat but he used: “The language of the people of Paradise is Arabic.” The sanad (chain of narrators) of this Hadeeth includes Al-`Ala’ ibn `Amr Al-Hanafi who is a weak narrator as unanimously agreed by scholars. Adh-Dhahabi said in his book Al-Mizan: Al-`Ala bin `Amr is Matruk (a narrator whose Hadeeth transmission was discarded due to unreliability). Ibn Hibbaan said: He is not to be taken as a proof at all. Ibn Hibban mentioned the narration of Al-`Aqilyof the Hadeeth referred to and said: This Hadeeth is Mawdu` (fabricated). Moreover, Al-`Aqily mentioned the chain of transmission of this Hadeeth and said: It is Munkar (rejected Hadeeth reported by a weak narrator whose narration conflicts with an authentic Hadeeth), of unconformable text and has no reference. Therefore, this Hadeeth is extremely weak and is not permissible to be taken as a proof or reference.
A Weighty Word 