where is the source for lighting two candles by every Tefillah with a Minyan?
Part of honoring the Bet Knesset is the custom of lighting candles. It is mentioned in the Shulchan Aruch Orach Chaim 151: 9. The mishna B'rura there says that the minhag is to light the candles even before people come for Tefilla for it is a sign that the Divine presence precedes the coming of the people.The Kol Bo says that was the mnhag in the Bet Hamikdash. The Makor Chaim on the Shulchan Aruch (Written by Rav Yair Chaim Bachrach zt"l) says that the minhag is to light two candles. However, most sources just mention the minhag of lighting many candles. The minhag is based on the pasuk "Honor Hashem with candles" (Yeshayahu 24:15. (See Rosh Yoma 8:9)