In the Psalter, the name of Moses, except Ps 77:21, appears only in the fourth book of the Psalter, Ps 90-106. We will see that Ps 77:21 prepares the part of Moses in the fourth book. In the beginning of the fourth book of the Psalms, the mention of Moses must be understood in relation to the theme of the death, yet present in psalms 88-89 and developed in Psalm 90. We have a relation to Deut 32-34 and the death of Moses. But Moses appears also like an intercessor that substitutes the king. In Ps 99:6 and 103:7 is developed the part of intercessor of Moses in relation to Exod 32-33. The attestation of Ps 105:26, corresponds to the transfer of the Davidic titles to the patriarchs and their descendants. In Ps 106:16 we have an allusion to Num 16-17, before the introduction of the part of the Corahites. In 106:23 we have a new allusion to the intercession of Moses with a new use of the Davidic titles. In 106:32 we have a new allusion to the death of Moses, an inclusion with Ps 90.