The Ho Phra Monthiantham (หอมณเฑียรธรรม) is a scripture hall on the north-eastern side of the temple. Its construction was paid for by the viceroy Maha Sura Singhanat, brother of Rama I. The hall is rectangular, surrounded on all sides with columns supporting a four-level roof. The entrance door is on the west side. The roof is covered in yellow and orange tiles. The pediment of the hall depicts the god Indra astride Airavata, the three-headed elephant. The inside of the hall is decorated with wood carvings of Hanuman, the symbol of the viceroy. The hall contains two mother-of-pearl inlay bookcases containing the Tripitaka. Today, the hall is also used for Buddhist sermons on Buddhist holy days. Formerly, the hall was used as a classroom for novice monks learning religious texts and as an exam room for monks.