When To Say It In Aramaic
The Gemara (Pesachim 87b) offers numerous explanations as to why Hashem chose Bavel as the destination for the exile. One such explanation is that the language spoken in Bavel, Aramaic, was most similar to Hebrew.
Yom Kippur
The short prayer the Kohen Gadol said after leaving the Holy of Holies on Yom Kippur, and why part of it was in Aramaic.
The Gemara (Pesachim 87b) offers numerous explanations as to why Hashem chose Bavel as the destination for the exile. One such explanation is that the language spoken in Bavel, Aramaic, was most similar to Hebrew.