This verse of the Holy Quran told us how to speak with the apostles of the Allah. Allah did not want that any one will try to make mocking of Allah and His apostles. The important thing is how we pay respect to our elders. If we pay the great respect to our boss, our elders and all those who are renowned in the society and say that it is the etiquette and the norms of a civilized society; then why we will not pay respect to the apostles of the Allah. On the name of the so called liberation of speech we always say that any one have the right to speak what ever he wish.
Allah informed us that such non believers who speak against the apostles of Allah will certainly face the painful chastisement in the life hereafter. We always think that we are fastidious in every thing but this thinking is very wrong.If some one will abuse to your father then you will stood to fight with him; but if some one is barking on the apostles of Allah and the sacred personalities then you raise the flag of liberation of speech. This is the open hypocritical behavior of our thinking. In many European countries the people are not allowed to talk about the Jews genocide "Holocaust" and if some one try to speak against it he will face the trial in the court.
While on the other hand if some one in these countries speak against the apostles of Allah then we say that we can not stop them on the name of rights to speak and we can not ban them because this thing will create a bar on the liberation of speech. But Allah informed us that He will not forgive all those who will speak against the apostles of Allah. Allah ordered the believers not to say the word "Raina" and say the word "Unzurna". Actually the meaning of "Raina" in the Arabic language is "Kindly see us" but the Jews change this word and speak in such a way that the other meaning of "Raina" which is "sheep man".
Allah forbid the Muslims not to use this word and say "Unzurna". Actually Allah informed us the basic thinking of Jews and all those who do not believe and advise us to sheerer from their way.Kindly read the verse of the Holy Quran as mentioned below:
"O you who believe! do not say Raina and say Unzurna and listen, and for the unbelievers there is a painful chastisement."
(Surah No: 2 & Verse No: 104)