Psalm 2
Seeing as Psalm 2:1–12 is quoted in the prayer of the believers, it makes sense to sing from this psalm. It can be sung perhaps at the beginning of the service or just before your Scripture reading.
Psalm 46
In Psalm 46:1–11 we confess that the Lord will help his church, that we can trust him even if the world around us should fall apart.
13 Lorsqu'ils virent l'assurance de Pierre et de Jean, ils furent étonnés, sachant que c'étaient des hommes du peuple sans instruction; et ils les reconnurent pour avoir été avec Jésus.