This image is from the Luttrell Psalter, which was made in England c. 1320-1340. You should consider the monstrous figures in relation to one another and to the text on the full page of the manuscript.
Transcription and translation of Latin from top of page to first line on following page, Psalm 105.25-30 (Latin from Vulgate; English translation from Douay-Rheims Bible):
murmurauerunt in tabernaculis
they murmured in their tents;
suis; non exaudierunt uocem Domini.
they hearkened not to the voice of the Lord.
Et elevavit manum suam super
And he lifted up his hand over
eos ut prosterneret eos in deserto.
them: to overthrow them in the desert;
Et ut deiceret semen eorum in na-
And to cast down their seed among
tionibus, et dispergeret eos in regionibus.
the nations, and to scatter them in the countries.
Et iniciati sunt beelfegor, et com-
They also were initiated to Beelphegor, and
mederunt sacrificia mortuorum.
ate the sacrifices of the dead.
Et irritaverunt eum in adinuen
And they provoked him with
-tionibus suis, et multiplicata est
their inventions: and destruction was multiplied
in eis ruina.
Et stetit finies, et placauit, et cessa-[vit quassatio].
Then Phinees stood up, and pacified him: and the slaughter ceased.