It is not essential to say specific words when entering ihram

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Sin and its Effects on the One Who Commits it
The status of Hajj in Islam, and the conditions of it being obligatory

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Related Answers:
Should he do Hajj on behalf of his deceased father who did Hajj, or on behalf of his elderly mother who has not yet done Hajj?
Purity (tahaarah) is not an essential condition for standing in ‘Arafah
If he is not sure about tawaaf, should he do the prostration of forgetfulness?
Sin and its Effects on the One Who Commits it
The status of Hajj in Islam, and the conditions of it being obligatory

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