user2442: Did the Buddha chant some mantra or holy word throughout his meditation? Or he was just silent to realize what is coming through him to interpret? 

user2265: During his developmental years (before he became Enlightened) he might have.
This is because mantras are a way for you to match vibration with a particular deity and thus receive their assistance.
The Buddha gave many such great mantras including the Zhunti mantra but a Buddha has no reason to use them because the Buddhas are all connected simultaneously through their uncovered dharmakaya/Tathagatagarba/Buddha-nature.

user4727: more like contemplating rather chanting.  
origination or dependent arising, Pratītyasamutpāda. He told Ananda he would contemplate, recite Pratītyasamutpāda when he was alone. 

2442: <p>Did the Buddha chant some mantra or holy word throughout his meditation? Or he was just silent to realize what is coming through him to interpret? </p>
 2265: <p>During his developmental years (before he became Enlightened) he might have.
This is because mantras are a way for you to match vibration with a particular deity and thus receive their assistance.</p>

<p>The Buddha gave many such great mantras including the Zhunti mantra but a Buddha has no reason to use them because the Buddhas are all connected simultaneously through their uncovered dharmakaya/Tathagatagarba/Buddha-nature.</p>
 4727: <p>more like contemplating rather chanting.  </p>

<p>origination or dependent arising, Pratītyasamutpāda. He told Ananda he would contemplate, recite Pratītyasamutpāda when he was alone. </p>
