The first four Caliphs, who successively ruled Muslims after the Prophet’s death. They are Abu Bakr as-Siddīq, ‘Umar ibn al-Khattāb, ‘Uthmān ibn ‘Affān, and ‘Ali ibn Abi Tālib (may Allah be pleased with them).
"Ihsān": doing what is "hasan", which means: good. Opposite: ugliness, in bad state. Other meanings: excellence, perfection.
Tījāniyyah
"Siddīqiyyah": constant, utmost truthfulness. It is derived from "siddīq", which means a person who always tells the truth and adheres to it and whose words match his deeds. Opposite of truthfulness: falsehood.