Invocations :

Invocation for Allah's protection from the False Messiah

199. Whoever memorizes ten 'Ayat (Verses) from the beginning of Surat Al-Kahf, will be protected from the False Messiah ¹ if he recites them in every prayer after the final Tashahhud before ending the prayer, seeking the protection of Allah from the trials of the False Messiah.

Reference:
¹ Muslim 1/555, another version mentions the last ten 'Ayat, Muslim 1/556.
²See invocations no. 55 and 56 of this book.

Invocation for someone who tells you: "I love you for the sake of Allah"

200. 'Ahabbakal-lathee 'ahbabtanee lahu.

May He for Whose sake you love me, love you.

Reference: Abu Dawud 4/333. Al-Albani graded it good in Sahih Abu Dawud 3/965.

Invocation for someone who offers you a share of his wealth

201. Baarakallaahu laka fee 'ahlika wa maalika.

May Allah bless you in your family and your property.

Reference: Al-Bukhari, cf. Al-Asqalani, Fathul-BAri 4/88.

Invocation (upon receipt of the loan) for someone who lends you money

202. Baarakallaahu laka fee 'ahlika wa maalika, 'innamaa jazaa'us-salafil-hamdu wal'adaa'.

May Allah bless you in your family and your wealth , surely the reward for a loan is praise and returning (what was borrowed).

Reference: An-Nasa'i, 'Amalul-Yawm wal-Laylahp. 300, Ibn Majah 2/809. See also Al-Albani, Sahih Ibn Majah2/55.