If someone offers you congratulations on first of muharram !!!!

If someone offers you congratulations, then respond to him, but do not initiate such greetings. This is the correct view concerning greeting your loved once during special occasions . So if a person says to you, for example“Happy New Year”, then you can say, “May Allaah make it a good and blessed year for you.” But you should not initiate such a greeting, because I do not know of any report that the salaf [early generations of Islam] congratulated one another on the occasion of the new year, rather the salaf did not regard the first of Muharram as the first day of the new year until the caliphate of ‘Umar ibn al-Khattaab (may Allaah be pleased with him).

Praying for another Muslim in general terms, in phrases that are not meant as a kind of ritual on special occasions such as Eid, is acceptable, especially if what is meant by this greeting is friendship and to show a friendly face to one’s fellow Muslim. Imaam Ahmad (may Allaah have mercy on him) said: “I do not initiate the greeting but if someone greets me I return the greeting, because responding to the greeting is obligatory. But being the first to offer congratulations is neither Sunnah nor forbidden.

Hope it is clear Allah knows the best.........