جَاءَ زَيْدٌ: Zayd came; an ordinary statement.
جَاءَ زَيْدٌ نَفْسُهُ: Zayd himself came, excluding the idea of a representative.
جَاءَ الْقَوْمُ كُلُّهُمْ: the entire group came, excluding absent members.
These are teaching comparisons; the first sentence has no emphasis.
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Tawkīd: Verbal and Semantic Emphasis
جَاءَ زَيْدٌ: Zayd came; an ordinary statement.
جَاءَ زَيْدٌ نَفْسُهُ: Zayd himself came, excluding the idea of a representative.
جَاءَ الْقَوْمُ كُلُّهُمْ: the entire group came, excluding absent members.
These are teaching comparisons; the first sentence has no emphasis.