After cross-referencing the diary of (Sap Upa) and the memoirs of the first batch of converts at Sairang (1906-1907), church historians have conclusively fixed the first original Mizo Christian hymn as:
Mizo hla hlui (folk songs) te kha hla thupui lam aiin a thluk leh a chhungthua thil danglam tak a nih avangin, Kristian hla hmasa hian Mizote nunah "Tonic Sol-fa" leh thluk thar a rawn thlen a. Hei hian Mizo Kristian hla tam tak lo piang leh tura kawng a sial ta a ni. mizo kristian hla hmasa ber fixed
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