The Day Of Death

In ipsa autem hac die manducaverunt; in ipsa autem et mortui sunt. Secundum autem circulum et cursum dierum, secundum quem alia quidem prima, alia autem secunda, alia tertia vocatur, si quis velit diligenter discere, qua die ex spetem diebus mortuus est Adam, inveniet ex Domini dsispositione. Recapitulans enim universum hominem in se ab initio usque ad finem, recapitulatus est et mortem ejus. Manifestum est itaque, quoniam in illa die mortem sustinuit Dominus, obediens Patri, in qua mortuus est Adam inobediens Deo. In qua autem mortuus est, in ipsa et manducavit. Dixit enim Deus: In qua die manducabitis ex eo, morte moriemini. Hunc itaque diem recapitulans in semetipsum Dominus, venit ad passionem pridiei ante sabbatum, quae est sexta conditionis dies, in qua homo plasmatus est; secundam plasmationem ei eam quae est a morte, per suam passionem donans. Sanctus Ireneaus Lugdunensis, Adversus Haereses, Lib V Caput XXIII Source: Migne PG 7.1185b-c

In this same day that they ate, in that they died. 1 But according to the cycle and progress of the days, after which one is termed first, another second, and another third, if anybody seeks diligently to learn what day out of the seven it was that Adam died, he will find it by examining the dispensation of the Lord. For by summing up in Himself the whole human race from the beginning to the end, He has also summed up its death. Thus it is clear that the Lord suffered death,  obedient to His Father, on that day on which Adam died in his disobedience to God. He died on the same day on which he ate. For God said, 'In that day on which you shall eat of it, you shall die the death.' 1 The Lord, therefore, recapitulating in Himself this day, underwent His sufferings upon the day before the Sabbath, which is the sixth day of the creation, on which day man was created, a second creation giving out of death by His passion.   Saint Ireneaus of Lyons, Against Heresies, Book 5, Chapter 23 1 Gen 2.17