Halakha Mazmur 116:1: Mishneh Torah, Blessings & Kol Bo

For a practice that is only customary, even if traced to the prophets, for example, taking the willow branch on the seventh day of the feast of Tabernacles, and—needless to add—if it is ascribed to the Sages, for example, reciting the Hallel^*Psalms 113-118 omitting 115:1-11 and 116:1-11. on new moons and the intermediate days of Passover, no blessing is to be recited at its performance.^*In the Ashkenazi ritual, a blessing is recited. Thus also any act, in regard to which you are in doubt whether it requires a blessing or not, should be performed without a blessing. One should always carefully avoid saying blessings unnecessarily; and should be heedful to recite, as often as there may be occasion, the blessings that are requisite. And so David said "Every day I will bless Thee and praise Thy name forever" (Ps. 145:2).

And this is the order of recitation: every day that it is completed you bless "Who sanctified us with His commandments and commanded us to finish the Hallel." And open with Hallelujah, (Psalm 113), when Israel left (Psalm 114), not unto us (Psalm, 115:1-11), LORD, remember us (Psalm 115:12-18), I loved (Psalm 116:1-11), how can I repay (Psalm 116:12-19), praise the LORD (Psalm 117), give thanks (Psalm 118:1-4), from the straits (Psalm 118:5-20), and it is customary to repeat each verse from I praise You to the end of the psalm (Psalm 118:21-29), because all the psalm up to I praise You is repeated in it of itself, as in from the straits I called on Yah; who answered me in width, Yah (Psalm 118:5), the LORD's right hand is high, the LORD's right hand does wonders (Psalm 118:16), and thus them all. And some do not repeat from please (Psalm 118:25) and on, and this is our custom — they pause and repeat please, LORD, save us please, and then afterwards please, LORD, give us success please, and although the whole thing is one verse, since please, LORD, save us please David's brothers recited, and please, LORD, give us success please David recited (Bavli Pesaḥim 119a:14). And although it is said only to pause in the midst of a verse to teach children, since one poet didn't say the whole thing we pause there. Or, one could say, they only said the prohibition of the midst of verses in Torah and Prophets, but not for writings. And bless afterwards "Let them praise You," and say the full kaddish.