The Buddha explains the Four Noble Truths and the five aggregates subject to clinging.
Khandha sutta - Aggregates
"Bhikkhus, these are the Four Noble Truths. What four? The Noble Truth of suffering, the Noble Truth of the arising of suffering, the Noble Truth of the ending of suffering, the Noble Truth of the way of practice leading to the ending of suffering.
And what, bhikkhus, is the Noble Truth of suffering? It should be said: 'The five aggregates subject to clinging.' Namely: the form aggregate subject to clinging, the feeling aggregate subject to clinging, the perception aggregate subject to clinging, the volitional formations aggregate subject to clinging, and the consciousness aggregate subject to clinging. This, bhikkhus, is called the Noble Truth of suffering.
And what, bhikkhus, is the Noble Truth of the arising of suffering? It is this craving that leads to renewed existence, accompanied by delight and passion, seeking delight here and there; that is, craving for sensual pleasures, craving for existence, and craving for non-existence. This, bhikkhus, is called the Noble Truth of the arising of suffering.
And what, bhikkhus, is the Noble Truth of the ending of suffering? It is the complete fading away and ending of that very craving, giving it up, relinquishing it, freedom from it, and non-reliance on it. This, bhikkhus, is called the Noble Truth of the ending of suffering.
And what, bhikkhus, is the Noble Truth of the way of practice leading to the ending of suffering? It is this Noble Eightfold Path, namely: right view, right intention, right speech, right action, right livelihood, right effort, right mindfulness, and right collectedness. This, bhikkhus, is called the Noble Truth of the way of practice leading to the ending of suffering.
Therefore, bhikkhus, effort should be made to fully understand: 'This is suffering'; effort should be made to fully understand: 'This is the arising of suffering'; effort should be made to fully understand: 'This is the ending of suffering'; effort should be made to fully understand: 'This is the way of practice leading to the ending of suffering.'"