Namaste Sangam,
thank you for the post.
are you interested in canonical teachings or commentary?
in the Samanaphala Sutta, which is a fairly long Sutta on the fruits of practice, it says:
"Quite withdrawn from sensual pleasures, withdrawn from unskillful mental qualities, he enters and remains in the first jhana: rapture and pleasure born from withdrawal, accompanied by directed thought and evaluation. He permeates and pervades, suffuses and fills this very body with the rapture and pleasure born from withdrawal. Just as if a skilled bathman or bathman's apprentice would pour bath powder into a brass basin and knead it together, sprinkling it again and again with water, so that his ball of bath powder -- saturated, moisture-laden, permeated within and without -- would nevertheless not drip; even so, the monk permeates...this very body with the rapture and pleasure born of withdrawal. There is nothing of his entire body unpervaded by rapture and pleasure born from withdrawal.
"This is a fruit of the contemplative life, visible here and now, more excellent than the previous ones and more sublime. "
it continues....
"
"Furthermore, with the stilling of directed thought and evaluation, he enters and remains in the second jhana: rapture and pleasure born of composure, one-pointedness of awareness free from directed thought and evaluation -- internal assurance. He permeates and pervades, suffuses and fills this very body with the rapture and pleasure born of composure. Just like a lake with spring-water welling up from within, having no inflow from the east, west, north, or south, and with the skies supplying abundant showers time and again, so that the cool fount of water welling up from within the lake would permeate and pervade, suffuse and fill it with cool waters, there being no part of the lake unpervaded by the cool waters; even so, the monk permeates...this very body with the rapture and pleasure born of composure. There is nothing of his entire body unpervaded by rapture and pleasure born of composure.
"This, too, is a fruit of the contemplative life, visible here and now, more excellent than the previous ones and more sublime. "
http://hjem.get2net.dk/civet-cat/theravada-writings/samannaphala-sutta.html
in the Anapanasati Sutta, the Buddha explains the benefit of meditation thusly:
"Mindfulness of in-&-out breathing, when developed & pursued, is of great fruit, of great benefit. Mindfulness of in-&-out breathing, when developed & pursued, brings the four frames of reference to their culmination. The four frames of reference, when developed & pursued, bring the seven factors of awakening to their culmination. The seven factors of awakening, when developed & pursued, bring clear knowing & release to their culmination. "
further along in the same Sutta;
"And how are the seven factors of awakening developed & pursued so as to bring clear knowing & release to their culmination? There is the case where a monk develops mindfulness as a factor of awakening dependent on seclusion...dispassion...cessation, resulting in relinquishment. He develops analysis of qualities as a factor of awakening...persistence as a factor of awakening...rapture as a factor of awakening...serenity as a factor of awakening...concentration as a factor of awakening...equanimity as a factor of awakening dependent on seclusion...dispassion...cessation, resulting in relinquishment."
http://hjem.get2net.dk/civet-cat/theravada-writings/anapanasati-sutta.htm