الطَّهَارَةُ مِنَ الْحَدَثِ
A person must be free of the ritual state that prevents prayer: Wudu for minor Hadath, Ghusl for major Hadath, or a valid substitute such as Tayammum when its conditions are met. Forgetfulness does not turn a prayer without the required purification into a valid prayer.
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The 27 Requirements for Valid Prayer: Purity and Covering
الطَّهَارَةُ مِنَ الْحَدَثِ
A person must be free of the ritual state that prevents prayer: Wudu for minor Hadath, Ghusl for major Hadath, or a valid substitute such as Tayammum when its conditions are met. Forgetfulness does not turn a prayer without the required purification into a valid prayer.